Hello Ma'am Roshan Varma here from India , I got mail for winner, but I don't know future process of their, I mail to team, but I haven't get response
@sadats118217 күн бұрын
❤❤❤❤❤❤
@olegzubatov321621 күн бұрын
Thank you for your interesting lesson. It was so informative and helpful for me.
@Mahi43980Ай бұрын
Hello ma'am i want to make career in jewellery designing. I passed out my 10th std now i am an Indian. I don't have any idea on how make career in jewellery designing. I need some career guidance. Can you help me out
@Mahi43980Ай бұрын
Hello ma'am i want to make career in jewellery designing. I passed out my 10th std now i am an Indian. I don't have any idea on how make career in jewellery designing. I need some career guidance. Can you help me out
@aliciaguerra-salazar5854Ай бұрын
You forgot to talk about the pearls from the Sea of Cortez, where production is very, very limited and they also cannot be faked. But they are also pearls but very very expensive.
@urvista0Ай бұрын
As said before, good information. But it must be said that Iranians had recognized spinel as a separate gem, thousands of years ago, and called it "Laal/لال", which means "The Red".
@urvista0Ай бұрын
Good informatons
@user-zv3mh5bw2rАй бұрын
Hello,i wanted to ask if you are able to share this presentation? i would like to present it in a class
@JdmisEduSgАй бұрын
Hi, you are welcome to share/present the video in class but unfortunately we can't provide the original presentation slides.
@jesstoo11032 ай бұрын
😍
@JdmisEduSg2 ай бұрын
Thank you!
@user-ov9eb7ij2x2 ай бұрын
But am bad with drowning soo
@JdmisEduSg2 ай бұрын
Hi! We have recently published a fully online version of this technical drawing course. Kindly note that this JD200 course is an advanced course that requires the completion of the JD100 course. For more information: Jewellery Design 100 Certificate: learn.jdmis.edu.sg/product/jd100-classical-jewellery-design-online-certificate/?KZbin Jewellery Design 200 Certificate: learn.jdmis.edu.sg/product/jd200-professional-certificate-intechnical-drawing-and-counter-sketching-online-certificate/?KZbin Let me know if you have other questions
@user-ov9eb7ij2x2 ай бұрын
Hey I am a student and I want to that course
@ramanboywss2 ай бұрын
Which pencils are these?
@JdmisEduSgАй бұрын
Hi, the color pencils that we use in class are Color Soft by Derwent. These are wax-based color pencils and what we can obtain in Singapore. If you are elsewhere, another very good brand is Sanford who produces a a type called Prismacolor which are equally good.
@lmntag79122 ай бұрын
Colour pencil name pls?
@JdmisEduSgАй бұрын
Hi, the color pencils that we use in class are Color Soft by Derwent. These are wax-based color pencils and what we can obtain in Singapore. If you are elsewhere, another very good brand is Sanford who produces a a type called Prismacolor which are equally good.
@VuyaneNgesi-gw1vz2 ай бұрын
It was a great class though i enjoyed it ❤😅
@JdmisEduSg2 ай бұрын
Glad you do :) Do follow us for more insightful content :))
@DQ9402 ай бұрын
Great video. But with natural diamond v synthetic diamond, you say that 100% of synthetic diamonds do not absorb UV light. But I thought lab grown diamonds can fluoresce under UV light? (which presumably means they must absorb UV light). What have I not understood?
@ATHEERAHMED-dp8jl3 ай бұрын
The video was really helpful Thank you so much.
@JdmisEduSg3 ай бұрын
Thank you for your great comment! Do check out other videos on gems and jewellery too :)
@bsctrainer52943 ай бұрын
Wov Thank You so much for this comptition
@JdmisEduSg3 ай бұрын
Thank you :) Are you planning to join?
@bsctrainer52943 ай бұрын
Yes ma'am, I have submitted my design in AI Concepts. My Name is Roshan Varma
@JdmisEduSg3 ай бұрын
@@bsctrainer5294 Thanks we will take a look .
@JdmisEduSg3 ай бұрын
🎯 Key Takeaways for quick navigation: 00:01 *🎨 Introduction to Jewellery Industry and Personal Journey* - The jewellery industry offers creative satisfaction and growth opportunities. - Introduced by Alex, a director at the Jewelry Design and Management International School. 03:15 *📚 Historical and Technological Evolution of Jewellery* - Overview of jewelry's ancient origins and the balance between traditional methods and modern technologies in design and manufacturing. - Introduced by Tanya Sidal, founder of JDM. 05:05💡 Principles of Jewellery Design - Essential aspects of jewelry design: beauty, durability, and comfort. - Emphasizes the subjective nature of beauty, the importance of designing durable pieces for generational passing, and the necessity of comfortable wear. 10:48 *✍️ The Art of Jewelry Design Through Tracing and Retracing* - Discusses how tracing different elements from various designs and combining them can spark creativity leading to unique jewelry designs. - Emphasizes the significance of experimentation with various placements and orientations of designs to achieve new creations. 11:42 *💎 Integrating Gemstones in Jewelry Design* - Explains the importance of understanding gemstone ratios and pre-fabricated parts like bezels in jewelry design. 12:39 *🎨 Techniques in Coloring and Rendering Jewelry Designs* - Details the transition from using paints to wax-based colored pencils for rendering designs. 15:01 *📐 Drafting for Manufacturers vs. Presentation for Customers* - Differentiates between detailed, measurement-rich drafts for manufacturers and visually appealing, colored designs for customers or competitions. 16:37 *✏️ Drawing Jewelry Designs for Client Presentation* - Covers how to sketch quick design ideas for client presentations, offering various options and customizations. 18:41 *🏫 Learning Opportunities and Support in Jewelry Design* - Introduces professional training courses in gemstones and jewelry design offered by JDM, supported by the Singapore government. 21:24 *🔨 Introduction to Jewelry Fabrication Process* - Overview of the initial stages of jewelry fabrication, including soldering and shaping. 22:32 *💎 Setting Gemstones in Jewelry* - Process of marking, drilling, and preparing metal for gemstone setting, including creating seats with burs and removing excess metal. 24:26 *💻 Transition to Computer Aided Design (CAD) in Jewelry* - Introduction of CAD technology's impact on jewelry design and manufacturing since the 1990s. 27:39 *🛠️ Advanced Features in Jewelry Design Software* - Examples of using software to speed up the design process, including automatic bezel, prong customization, and quick creation of complex designs like cathedral rings and halos. 30:36 *💎 Advanced 3D Jewelry Design and Customization* - Introduction to creating complex jewelry designs using specialized software, featuring a design with nearly 80 gemstones. 31:43 *💡 Benefits of Computer-Aided Design (CAD) in Jewelry Making* - Faster time-to-market and the ability to create sophisticated designs more easily. 34:00 *🖨️ Transitioning from Design to Manufacturing: Wax Models and 3D Printing* - Discussion on producing wax models for jewelry casting using milling and 3D printing technologies. 36:17 *🏭 Lost Wax Casting Process in Jewelry Manufacturing* - Overview of the lost wax casting process, including the creation of wax trees and the calculation of metal needs. 38:07 *🔥 Mold Making and Burnout Process* - Detailed explanation of preparing the mold material, ensuring there are no air bubbles, and setting the material to capture the design's details. - Detailed look into the technical aspects of melting metal for casting, emphasizing temperature management to avoid cracking or improper filling of the mold. 42:27 *💧 Devesting & Initial Cleaning of Cast Metal* - Explanation of the devesting process, involving the removal of mold material by submerging the hot cast in water, causing the investment material to dissolve. 43:21 *✂️ Post-Casting Cleanup & Gemstone Setting Preparation* - Describes the post-casting process which involves removing the metal flow channels and preparing the casting for gemstone setting. 45:00 *🛠️ Technology Evolution in Jewelry Manufacturing* - Examination of the roles of new and traditional technologies in jewelry design and manufacturing processes. 47:02 *🌪️ Innovative Use of Powdered Metals in Jewelry Design* - Introduction to using powdered metals for jewelry design, a method born from precious metal recycling advancements. 49:22 *🌟 Advancements in Metal Clay Technology for Jewelry Design* - Overview of the properties and benefits of using metal clay in jewelry making. - Discusses the initial composition of metal clay, highlighting its brittleness during the drying process which facilitates easier refinement. - Explains the firing process, where the metal particles are sintered into a solid piece, burning away the organic binder to leave pure metal. 51:26 *🔧 Technique Flexibility and Material Variety in Metal Clay* - Metal clay offers a unique approach to jewelry design with a variety of metals. - Details the versatility in material choice ranging from pure silver to bronze, allowing for customization in jewelry properties. - Highlights how metal clay pieces are almost indistinguishable from traditional jewelry and can be further processed with conventional techniques. 53:55 *🚀 Streamlining Jewelry Manufacturing Processes* - Metal clay accelerates production and offers advantages for both independent designers and larger companies. - Demonstrates how metal clay simplifies the initial steps of jewelry production, potentially by passing traditional casting methods. - Emphasizes the technology's appeal due to lower investment costs and a quicker learning curve, making it accessible to beginners. 55:03 *🎨 Practical Demonstration of Metal Clay Usage* - A hands-on example showcasing the ease of working with metal clay from shaping to finishing. - Describes the malleability of metal clay, allowing for easy shaping and forming into desired designs. - Details the post-firing steps, including brushing and polishing, to achieve a high-quality finish on the jewelry piece. 58:14 *💍 Differentiating Fashion Jewelry from Costume Jewelry* - Clarifying misconceptions and defining the distinction between fashion jewelry and costume jewelry. - Outlines that fashion jewelry, unlike costume jewelry, is not mass-produced to the point of compromised quality. - Notes that fashion jewelry uses superior manufacturing techniques and materials compared to costume jewelry, which often relies on adhesives and lower quality materials. 59:06 *💎 Exploring the Craftsmanship of Fashion Jewelry* - Distinguishing fashion jewelry through its handcrafting process and customizable material use. - Highlights the meticulous effort in making each fashion jewelry piece, allowing for a range of styles and techniques. - Emphasizes the importance of centering design elements and high-quality materials in fashion jewelry, contrasting with mass-produced costume jewelry. 01:05:12 *🏫 Introduction to Jewelry Design and Management International School* - Overview of the educational offerings in jewelry design and gemstone knowledge. - Presents the school's role in providing comprehensive training and qualifications in the jewelry sector since 2007. - Details on the specialized, hands-on approach to learning with experienced instructors and small class sizes for personalized education. 01:09:22 *🎨 Comprehensive Training Approach* - Overview of JDM's philosophy to equip students with all necessary tools for practice after course completion. - Provision of essential tools and materials for various courses, ensuring students can continue practising skills at home. - Emphasis on hands-on learning and real-world application of jewelry design and craftsmanship. 01:10:03 *💎 Diverse Jewelry Education Paths* - Introduction to different career paths within the jewelry industry offered by JDM. - Explanation of courses tailored for gem enthusiasts, designers, craftspeople, and entrepreneurs. - Highlight on modular course structure, allowing for tailored education paths culminating in diplomas and degrees. 01:11:55 *📚 Core Programs Overview* - Detailing of the three core programs: Fine Jewelry Design, Precious Metal Arts, and Fashion Jewelry. - Distinguishing between conceptual design work, hands-on craftsmanship, and entrepreneurial approaches to jewelry production. - Flexibility in course selection and progression, accommodating various interests and career goals in the jewelry field. 01:14:53 *🏅 Advanced Education and Honors Programs* - Explanation of honors programs and advanced diplomas leading to international degrees. - Focus on industry-specific projects providing hands-on experience and in-depth knowledge. - Pathways to further academic and professional advancement in the jewelry industry. Made with HARPA AI
@karand41553 ай бұрын
Will this event be streamed in any platform or will they be any videos released after the event ends regarding the results
@JdmisEduSg3 ай бұрын
Hi, the announcement will be by email and on the website as well as social media. Finalists will be informed directly and it is possible that at the final stages we have either recorded or live events on KZbin.
@jamalskp72804 ай бұрын
Finaly i understand wath i have i have some small type 2a diamond i need to send lap Thanks for this video
@JdmisEduSg3 ай бұрын
You are welcome :)
@ristorinne58174 ай бұрын
As an 59 year old jewelry hobbyist, former truck driver, your video is very, very professional and easy to follow. And the ring is beautiful. If you don´t mind, i would wan´t to try make one to my wife 😀. Thank you for sharing you craftmanship 😍
@JdmisEduSg4 ай бұрын
Hi, thank you for the kind words. Your wife must be really lucky, that is such a sweet gesture :)
@vavilovasvetlana90444 ай бұрын
wonderful and gorgeous story about my favorite crystal- tourmalines, thanks for it.
@JdmisEduSg4 ай бұрын
Yu are welcome :) Stay tuned for more.
@worlderrorcoins4 ай бұрын
Hi very good
@JdmisEduSg3 ай бұрын
Thank you
@VBugatti4 ай бұрын
WoW WoW WoW! Congratulations to Tanja Sadow, JDMIS and SJDA on this extraordinary initiative. No time to waste! The prizes are inspirational. Got to get working on my submission. Good luck to all - Vicenza here we come.
@JdmisEduSg3 ай бұрын
Thank you! Looking forward to your submission here at JDMIS ;)
@wowyummyyy4 ай бұрын
L I K E 👍🏿 👍🏽 👍🏻 👍🏽 👍🏿 👉🏻 💯 💢 💯 💢 💯 👈🏻 🤩 🤩🤩🤩🤩
@JdmisEduSg4 ай бұрын
Thank you!
@flambojan_lab4 ай бұрын
Complimenti, brava e professionale. Parola di orafi italiani
@JdmisEduSg4 ай бұрын
Ahah grazie mille per il complimento!
@Anukrishna14384 ай бұрын
What is the price of natural white top quality turmlin 10 carat
@wilma-gv9ff4 ай бұрын
Gee watching someone polish copper...
@JdmisEduSg3 ай бұрын
You're right, it might seem mundane at first! But polishing copper is a very important step in metalsmithing. It makes all the difference in the final look of the piece. This video is actually a preview of our metalsmithing course, maybe you'd be surprised at what all goes into making beautiful jewelry!
@maryleemartz37224 ай бұрын
How do I get one of the sheets you used to figure out you lenth to cut your wire?
@2flight5 ай бұрын
Very helpful. Thank You!
@JdmisEduSg5 ай бұрын
You are welcome. Follow for more :)
@bobbyjon86365 ай бұрын
how about Lab grown Diamont?
@user-ov9eb7ij2x5 ай бұрын
Can a child try or do the business
@JdmisEduSg5 ай бұрын
Hi! This is certainly something that is beginner and children-friendl! This fun and therapeutic arts is good both as to make side income or simply for developing aesthetic appreciation and hand-eye-coordination. Of course how much time a child or teenager should spend on jewellery making as a hobby, with or without financial incentives, is a matter of discussion and arragement within the family. If it's about our school's age requirement, our physical classes require a min of 16 years old and above for enrolment :)
@user-ov9eb7ij2x5 ай бұрын
@@JdmisEduSg hey I'm 16 years old
@user-ov9eb7ij2x5 ай бұрын
And I also want to do this course
@JdmisEduSg5 ай бұрын
@@user-ov9eb7ij2x Certainly, this is the link to the full premium course by our School for Professional Fashion Jewellery Making you can take a look: learn.jdmis.edu.sg/product/fj100-professional-certificate-in-creative-and-essential-fashion-jewellery-knowledge/?KZbin
@Freshta_official5 ай бұрын
How I can join the online class ???
@JdmisEduSg5 ай бұрын
Hi! Thank you for your interest. The course is purchased and enrolled via our elearning platform: learn.jdmis.edu.sg/product/professional-certificate-in-classical-jewellery-design-foundation/ If you are keen, you can also send us an email at [email protected] for any questions and we also advise any promotion that is still available.
@JewelrybyHMI5 ай бұрын
love your videos! Also, i have an offer for you, if you want to buy loose gemstones i can provide them at a reasonable price and good quality at the same time let me know if you are interested
@alesiarodriguez49625 ай бұрын
I absolutely love this video! Awesome job explaining everything. I am a beginner, so naturally I have a silly question. When you bow the ring shank wires does it change the initial size of the ring you measured for. It seems like it would. Would I need to go up a size when measuring wire for my shank? Thank you so much for this tutorial!
@JdmisEduSg5 ай бұрын
Hello and thank you enjoying the video, I hope you will have a chance to make you very own ring For the ring size the most important thing is to use the chart which has been devised so as to get the size to fit perfectly. You need to know 1. what wire gauge you are using (usually 18g is a very good and sturdy thickness) 2. Your fingersize in USA measurement (there are lots of countries using their own measurements and the chart works really well for USA sizes.) With these two things the ring size will be perfect. How it works is to select the right ring size from the left hand column and match it to the gauge from the top row. This produces a length which works perfectly every time: i.imgur.com/Qet7mTe.png Say my size was size 6 US and I am working with 18 ga so the length of 18ga wire to fit around the finger will be 54.6mm long. Since it is hard to measure to the 10th of a mm we can round to the nearest 1/2 mm. (We can measure 54.5 this would work as 0.1 of a mm will make little difference. So always round up or down to the nearest 1/2mm.) If your finger size is 5 1/2 you need to take the size 5 result and the size 6 result, and average them out. 52.1 + 54.6 = 106.7 / 2 = 53.35 so I would round this to 53.5mm. Hope this helps and would love to see how your ring turns out Best wishes, Tanja
@carlosmosconi79315 ай бұрын
Thanks for your PR! I wish you were closet to the US & Europe
@JdmisEduSg5 ай бұрын
Hi Carlos, haha that's true. We are here in Singapore but we have many international graduates too and in the past two years we have been building our portfolio of online courses so everyone can learn gems and jewellery online. You can check them out here: learn.jdmis.edu.sg/all-courses/?KZbin
@thomasmc25065 ай бұрын
Newcomer to the industry here, getting some due diligence in. Thanks so much for the Adamas demo and the informational overview. Incredibly helpful.
@JdmisEduSg5 ай бұрын
Glad it was helpful! Do subscribe for more insightful content in the future if you haven't :)
@sakeenabanu97686 ай бұрын
U are my fav mam inshaallah I wish to meet u once ❤❤❤❤
@JdmisEduSg5 ай бұрын
Thank you :)) Sure one day when you come to Singapore :)
@aimanabdullah57126 ай бұрын
Thanks for sharing this information! 😊
@JdmisEduSg5 ай бұрын
You are welcome :)
@ahmadirfan82426 ай бұрын
Dear mam Can I start my career in jewelry as I am 40 years old
@JdmisEduSg5 ай бұрын
Hi! Yes you can definitely start a new career in jewellery after 40 years old or even later. At JDMIS here in Singapore, we have trained over 5,000 graduates and the majority of whom are actually mid career professionals in their late 30 or 40s. Many of them only discover their passion and confidence to start something in jewellery after getting tired with their 9-5 office job. You can do too! For the first step, I would recommend checking out some starter Certificate course here at JDMIS' online learning platform? learn.jdmis.edu.sg/all-courses/
@claunomadak6 ай бұрын
What program did u use
@JdmisEduSg6 ай бұрын
Hi! The jewellery concepts are generated using JDMIS-trained Stable DIffusion XL AI Model.
@carlosmosconi79316 ай бұрын
Your knowledge is very thorough, you apply real technical words, in summary you make a difference
@JdmisEduSg6 ай бұрын
Thank you Carlos :)
@chanux45106 ай бұрын
Nice video💎 I want to learn gemmology 🙂
@JdmisEduSg5 ай бұрын
Thank you for your interest! If you haven't do subscribe to our channel for more insightful and free gem content. If you are even more serious in learning gemmology for your career, you should definitely check out JDMIS' online Certification programme here: learn.jdmis.edu.sg/product/gem-jewellery-trade-secrets-online-certification-course/. It gives you the confidence and practical knowledge to succeed in buying gems and jewellery.
@superfluity-of-naughtiness7776 ай бұрын
Question...i got a ruby that has a meduim dark tone in outdoor/diffused lighting but when indoors it has a medium tone ( no distinction). how is the tone defined in the trade? or is this one of those "gray zones" not well defined phenomenon that is determoned differently by different "experts" ?
@JdmisEduSg5 ай бұрын
Hello and Happy New Year! When properly grading in a lab, tone it is divided into 10 categories from 1 to 10. Graders in labs who have practice grading the tone can distinguish between the different nuances but anyone else who does not practice this daily, and looks at tone infrequently, is best to divide into just three (or 5) categories such as: Light, (light to medium), Medium, (medium to dark), and Dark. It is not so much a gray area but rather something impossible to distinguish without the proper training and practice. Can there be different results by different labs?? (Is the next question most people ask) YES, Lots of different labs do have different methods and sometimes they do not all get the same results. If it is high quality, best thing to do is to have the gem graded by a well recognized and reputable lab. Hope this helps! - Tanja
@superfluity-of-naughtiness7775 ай бұрын
@@JdmisEduSg thanks for the great detailed info...the next thing i got to figure out is...the limitations/boundaries between tone and saturation...there are some models that are trying to use a 3-d model for color determination...
@sergioortega58696 ай бұрын
Hello, good day and happy new year, you know, I have a 10.14 carat Myanmar Ruby with sub-transparent inclusions with an untreated half tone Certified by genuine GRS and I am a collector, I have had this ruby for years and I am trying to sell it in my area. but they tell me that it is a very valuable piece and it is very expensive for them to sell it in jewelry stores in these areas since they only deal in diamonds and I do not know its value
@JdmisEduSg5 ай бұрын
Hello and Happy New Year to you too! A 10+ ct untreated Ruby is very special and of great value. "Very expensive in your area?" Where is the area you are trying to sell this? We are in Singapore where there is reasonable demand for such special things. I would probably best advise you to first go to some good, high-end jewellers and show them the gem with the view to selling it and get several quotes from the various places. This should give you a ball park figure on what they would be willing to pay. If you are not comfortable to ask the jewellers the price for the gem in view of selling it, you could pretend you want to make two rings for each of your daughters. Show them the Ruby and say that you only have one but need to find another of similar size, shape, quality and value and let them give you a quote for what they can find. This might at least get you an up to date selling price!Also you could approach an auction house like Sotheby's, Christies or Bonhams. Since the gem does have a cert this might be a good place to find other collectors. I do hope this helps and wish you all the very best in your quest. - Tanja Sadow.
@ijazahamed87896 ай бұрын
Where should I sell the gem when I have it ? I mean how can find a genuine buyer?
@JdmisEduSg5 ай бұрын
Today with the quantity of synthetics on the market most genuine gem buyers are likely to go and buy from a reputable jeweller. Many gem buyers have had disappointing experiences with on-line shopping and would be skeptical to buy high value items this way. Here in Asia most people who want to sell their gems or jewellery will go to a pawn broker. It is not great as they retrieve a fraction of what the true value of the jewellery is but, on the other hand, it is possible to get some value in an immediate timeframe which otherwise would not be possible. Any other way will take much longer to find the right person who can sell it for you or will take it on consignment until they can actually sell it. Some people work with their local jewellers who may help out but its a bit like asking someone to buy a second hand clothing item with the only difference that it is more valuable. Loose gems would be much easier to sell than finished jewellery as when trends change and old designs go out of style it becomes even more challenging to find the person who will love the old style. Where are you from? - Tanja
@ijazahamed87895 ай бұрын
@@JdmisEduSg I am so happy to see ur replay ☺️ thank you so much . Am from Sri Lanka 🇱🇰.
@metatron19806 ай бұрын
Thank you I enjoyed it
@JdmisEduSg6 ай бұрын
Glad you enjoyed our content! Do subscribe for more coming soon:)
@noahmel36776 ай бұрын
I've enjoyed every second in this video.. thank you for share such important information ❤️
@JdmisEduSg6 ай бұрын
Hi there Noah, Firstly, thank you so much for taking the time to make a comment and to let me know the video was useful to you. I really appreciate your effort and thank you for finding and watching our content, this motivates us to make more! If you have time take a look at some of the other things that are in our KZbin channel, we have some great content on gemstones as well as some good introductory and overview content about how jewelry is designed and then manufactured... Do consider subscribing as we are planning a lot more content in 2024. Have a great day and thanks again for your attention and effort. Tanja
@noahmel36776 ай бұрын
@@JdmisEduSg i already have subscribed the channel and saved a playlist, I won't miss this kind of art. Thank you again for this amazing content ❤️❤️
@TheSilverSmithsBench17 ай бұрын
Where is that fire brick from? Not finding this on RioGrande
@JdmisEduSg7 ай бұрын
Hi! The fiber brick we use here is made of compressed vermiculite. But you can get the same result from ceramic firing bricks as well. I'm not sure where you're located, but if you're buying from the US you might like to try cool tools. cooltools.us/products/ceramic-fiber-brick-2-1-2-x-4-x-7 Alternatively if you search Amazon you will likely find the compressed vermiculite as well. If you're based in Singapore you can always buy the fiber brick from artclay.asia - Tanja