Elementary Specific Gravity in the Gemology World

[@davidmaisel8062]

Great video Starla, I really like the way you explain the concept of SG so clearly, Im a fan!

[@chernetayenew637]

Nice demonstration! Keep it up

[@Shandchem]

Very interesting and nice to see different methods to measure specific gravity of objects.

[@vageeshbabuhanur8769]

Your nice presentation is marred by the disturbances of camera focusing both visually and sound-wise.

[@vaibhavjuneja8299]

Thanks Madam I really love your video. You tell the concept very deeply and clearly.

[@thisissoeasy]

Extremely well explained and great film-work! Thank you very much for sharing your extensive knowledge.

[@joesmith1922]

Good video, thanks! And a trip down Retro Road!

[@goldvikash]

Very nice information dear

[@36000408]

Thank you vary much for this video! I am just getting into gems and am trying to learn how to identify them more accurately. You have given me more tools to aid in my endeavors.

[@starlatrwc]

Lol, this was filmed on my old hand held pocket camera, before phones had zoom and video like they do today!

[@occhamite]

The scale is a great idea. I'd point out that you want to use a wide water container (as you did) and not something like a tall, narrow vial (say just a little wider than the stone) because the water level will rise when you add the stone, immersing a bit more of the wire. That would increase the total amount of water displaced, making the stone's weight in water appear closer to its weight in air than is actually the case. A wide container of the same height obviously holds much more water than a narrow one, so a stone of a given volume will cause a level change proportionately lower. You could put a mark on the wire at the point where you want the water level to be to, and adjust the wire after the stone is added, if the level change is too much. If you did that, a smaller, more portable water container could be used.

[@starlaturner]

Thank you for your thoughtful advice!

[@ArmandCury]

Miss Starla, congratulations on your video. Don't you think you might go further and teach even more about gemology on internet ? Maybe here on KZbin, indeed. I would love to learn more and more about this classy and important subject. And I am sure there are millions of people who could really enjoy been taught that way. Please, think about that.

[@amrk1379]

great video thanks

[@عبدالباسط-ج9ب]

Nice video but can you please tell how to mesure human specific gravity is it the same way like stones

[@chernetayenew637]

Please,show us if there is advanced method of checking SG of gemstone?

[@starlaturner]

The advanced method, most available is using a better scale set up, more permanent. But the methods I have shown are pretty accurate and the hydrostatic method doesn't use harsh chemicals.

[@Edfromars]

Hi Starla, Please explain why in some videos in You Tube they say that the the formula for S.G is : weight in air / weight in water. Other videos say S.G.= W in Air / (W in Air - W in Water). I tried doing both formulas with 10 known different stones. The first formula worked the second didnt. Why?

[@betunhuerta8425]

Asking same here

[@Insower]

Please read en.wikipedia.org/wiki/Archimedes%27_principle The first formula would be correct if the weight IN water was Weight of displaced water The only correct formula is S.G.= W in Air / (W in Air - W in Water) and it was used in this video

[@ArtsCraftsJoe]

Great demo. So I can make my own holder to hold the stone holder? Thank you!

[@chernetayenew637]

What about the accuracy of this test?

[@kamalkulkarni3703]

Nice.. Can you explain what is treatement like flix. Thernal.. How they do this..

[@saumur69ify]

Can the specific gravity be done with the scale setting on grams? Or it must be on carat?

[@judaskidd2155]

Just to let you know that the explanation of how Archimedes came up with the formula is slightly different it was not good and silver at the same time it was a jewelled golden crown that was not of uniform shape. He had pondered a way to measure the wright of the crown to give his king a value. While taking a bath he noticed as he himself entered the basin the water rose and retreated. This gave him the eureka moment that he used his weight in carob seeds vs the weight of the displaced water and arrived at the formula for specific gravity. It was proven later by another group of mathematicians by using various materials of known weights to create the tables of s.g. used today

[@starlatrwc]

Hi Judas, Thanks so much for the clarification!

[@milesnn]

Awesome awesome thank you

[@Shifan1979]

how to find out the reall and fake sapphire? thank you so much

[@starlatrwc]

To separate natural from synthetic sapphires you need to look at what is in the stone because the stones will both have the same properties. The internal characteristics will reveal how the stone was grown.

[@Shifan1979]

hi thank you somach for your time, bought a blue sapphire in that certificate says its Treatment: (Indications of thermal enhancement (TE1).im not sure is what is that still genuine? thank you ....i want to send the copy of cet but i dont know how ... im a gem merchant from sri lanka but this stone too clean glass body,confusing me

[@LostWithoutHer]

Hi Starla! You were my professor for Colored Gemstone Grading at the GIA. How does this compare to dividing weight in air by weight in water without the subtraction? Some youtubers say to do it that way but to me that makes no sense. Thanks for your feedback!

[@starlaturner]

Its divided by it's loss of weight in water, so you are right it doesn't make sense. Cheers. I do the FGA program, not the GIA program...

[@Agigoldinc]

Where can I get the Gemological testing Liquid you use there ? Thanks

[@louis525]

jan 10-2016 do y0u remember the store name and location that you bought these big gemstones?

[@nextlevel5963]

Hi I could you please tell me the Gem Weight Scale and Reference / model number please!

[@starlatrwc]

Likely a model like the Gemoro platinum PCT251 only mine is a bit older. Cheers

[@nextlevel5963]

Thank you I have been looking for an exact scale with precision so I will take your advice Thank You!

[@merhawi79]

tnx in advance. can I get help on how to find the heavy liquids tool box

[@starlatrwc]

Maybe from a scientific supply company.

[@merhawi79]

​@@starlatrwc Thank you very much. there is this sapphire mineral in my area i was thinking about the busy so it will help Identifying

[@srilankagemstones6662]

Thank you it is really helpfull for me.

[@kathyterrell7591]

Was just about to buy a very expensive machine to test gemstones,but will buy a spectrometer instead. Thanks!

[@BADSYNE]

awesome!!

[@anthonychan3483]

Hello Starla. Is there any machine out there to measure specific gravity rather than use methylene iodide? Thank you.

[@starlatrwc]

Hi Anthony I don't know of any machine, just the standard hydrostatic scale method.

[@1Rowdy1derful]

A simple issue. How in the world did she make it so complicated?

[@vaibhavjuneja8299]

Cameraman is creating disturbance in voice. When u tell the concept.

[@louis525]

Dec 25-2015 where did you purchase those -2- big gemstones(clear and blue) that you start the video with..?-They seem to be the same size...Ottawa Canada

[@starlaturner]

+louis525 Hello, I actually bought these stones at the dollar store, they are just glass!

[@louis525]

dec 28 do you mean dollar strores in usa or Canada?

[@starlaturner]

+louis525 I actually bought them in Canada, in Vancouver but I have seen them in the US as well. They are always on the counter and they are sporadically stocked.

[@louis525]

i have not seen any here at dollarama or dollar stores in Ottawa..a pity

[@Kamalkhan-gi3tk]

Very informative and i liked the class more with those professional giggles tch tch tch 😁

[@mkamka-ru2vt]

❤

[@bobbylong4443]

❤❤❤ love this but camera needs oil

[@rhianngacusan814]

now that is math, there is no way of FAKING NOW! hahahahaha!

[@كيفيةمعرفةاستخراجالكنزوالذهب]

gooood

[@siiv7973]

😂😂😂 Така не се орави! That not is ng rihgt!