💎 Tone Differences in Gemstone Colour | Gem Foundation Snippet 7 ✨

In the next installment about Colour as an important value factor for gemstones, we will focus on why tone differences are important in gem valuation? In the 7th instalment of this mini series in gem foundation, you'll understand what tone means in colour theory, and how tone differences can affect how gem varieties are identified.
This mini series focusses on teaching you essential tips on how to select the best coloured gemstones and diamonds for yourself, guided by gem and jewellery expert Tanja Sadow. You'll learn how the 4C's (Colour, Clarity, Cut, and Carat Weight) affect the value of both diamonds and coloured gemstones and gain useful tips on how to maximise your budget during your next purchases. Please enjoy!
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[@sergioortega5869]

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

[@JdmisEduSg]

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.

[@superfluity-of-naughtiness777]

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" ?

[@JdmisEduSg]

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-naughtiness777]

@@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...