GIA Video Training - How to Separate Natural from Synthetic Ruby by John Koivula (VHS) (1988)
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- เผยแพร่เมื่อ 19 ก.ค. 2018
- GIA Video Training - How to Separate Natural from Synthetic Ruby by John Koivula (VHS) (1988)
archive.org: archive.org/details/GIAVideoT...
I learned SOOOOO much from this man and am the gemologist I am because of his guidance and instruction. THANK YOU, John Koivula!
Where I have rough ruby
A great example of a piece of quality education. ❤
Surely one of the best , if not the ! About Gems !
Thank you for having done , kept and shown it !!!
The video quality may keep some people from watching this, but it is exceptional.
Old But Gold.
Excellent explanation. Thanks for sharing this!
The EXPERT has spoken.. THANK YOU SO VERY MUCH.
Excellent, informative, educational. Thank-you
Thank you thank you so much for sharing and posting.
Thank you very much! I love watched .
Wonderful presentation, worth many ships
one of the best gemologists in the world !
Istituto Gemmologico Genovese - Gemological Institute of Genoa
He is my teacher
awesome explain thanks
Thank you very much!
Great info
Very clear and professional classes. I learn more with you. The second name of synthetic rubies is ''french diamonds''. In France, they produce a lot of those ones. Thanks.
Спасибо ребята за этом видео
Great Job
Realy great.
Hallelujah
Well now my brain is exploding with information. And I have a ton more questions.
how in depth and revealing,sadly the job of gem identification is getting more complex by day,loved this video though,thanks for share
Gem mining most of the ruby have fracture need to be filled with glass or other compounds to facilitate grinding.
Glass that can be filled with ruby divided according to chemical composition, there are several types as follows:
1. Soda-lime glass
2. Borosilicate glass
3. Lead glass or crystal glass This type of glass has more than 24% lead oxide and has a high refractive index.
4. Opal glass
5. Aluminosilicate glass
6.Alkaline-Earth Alumino silicate
7. Glass-Ceramics
8. Crown glass
9. Flint glass
10. Bismuth glass
Because lead glass has good optical properties but is not durable and can dissolve in water, acids, and alkalis when used for a long time. Therefore, choose to buy gemstones that do not contain lead glass and bismuth glass. Other types of glass the quality of gems will be different, such as bismuth glass. However, when purchasing gemstones, you should choose the type that does not contain glass contaminants. and inspected with an X-ray Fluorescence (XRF) machine only because it can determine the amount of lead in percent. To consider the appropriate purchase price.
Please do a series on just vintage jeweler training videos! I love the cut edits at the beginning of this video and the awesome text overlay blue screen! Lol so awesome! I miss the 80’s! The speaker or teacher looks like he is headed to a wedding!! Lol
I upload what I can find, and I don’t think I have any more of these off hand!
Would anyone know: He mentioned oval cut would be a clue that the ruby is natural; however, would a cushion cut be included with the oval cuts or is it a clue that it would be more synthetic or manufactured?
A very good vid. Its ancient. Note the yellow dot matrix monitor. Synths Sims have come a long way since then. Basic principles still apply. I'd recommend something more up to date. GIA has many.
What difference should it make, if the synthetic ruby is identical in look and chemical composition as the natural ruby?
the difference is thousands/millions of years in earth due to nature's conditions vs a few weeks in a controlled lab setting
Are those syntetics is have 9-10 lights level in diamond selector test?
On Ebay, you can find a 200 carats lab grown, uncut ruby, for under 20$ including delivery. It look like a small half carrot cut in half lengthwise.
You can also find cut ruby (real lab grown ruby). Again, under 20$ for 1-20 carats, but the cut is usually pretty poor quality.
So, where can I found someone who can cut a bunch of 1-5 carats out of this 200 carats and make it look very good?
I have this question. When you show the masters some thing. Can the less say any different¿
more?
Looks like a V-2 rocket.
I have a question though, polychromatically, does a synthetic ruby have same qualities as a natural, because from what I can see it doesn't? Because I've seen a number of synthetic Rubies that are uniform in colour and lack the polychromatic nature of a natural ruby.
مستحيل
There is some sound muted and then turn on, again and again automatically when the background is playing for a half seconds. How can I learn in full video??
I hope this is not a good sound quality, I think.
Ys the best ruby burma
if he has eyeglasses he would be tom cruise from tropic thunder 😇
أود التواصل معك
သင်၏ဗဟုသုတများမျဝေပေးလိုက်သည်
So there isn't any good people in the gem industry to make this law.
At 27:08 you say you "have also seen Comet Tails in Natural Stones". It would be Prudent to also Provide an image of a Comet tail in a Natural Stone as it would appear there, as well as with any other examples or visuals that appears in both Natural and Synthetic to represent each as they appear in their respective stones. Not having an image of both, would be a good indicator to Skip that particular subject until in an unbias position is established where one can provide such an important example of both scenarios to offer truth and value, to provide complete and non partial information for a professional presentation.
It would need subtitles, along . Not entirely understandable.
25:57
Ok
What could an ethical manufacturer of synthetic stones add as a dopent that would fluoresce in a unique way under UV and yet not alter it's appearance in natural light?
တောက်ပနေသောကျောက်မြက်ရတနာများကြည်နေရသလိုပဲ
So... If you can fool a gemologist with a lab grown stone... What should you pay for a "natural stone"?
Lab grown stone have the same crystal structure and component and characteristic of the best stone ever found.
They are not involve in conflict
They are way more eco friendly (no digging and almost no pollution)
Did I mention they are hilariously cheaper!
There is no comparison between a natural stone and a fake lab grown stone. One has taken thousands of years to make it special and just so. A lab one takes 2 weeks and the lab can make trillions of the same thing . BORING
@@olive3186 First, the "lab grown ruby" are not "fake". A "Fake ruby" can be a zirconia, a tinted glass or even a tinted piece of any cheap stone... even plastic.
A lab grown ruby is a 100% real ruby. Sure, it will take about 16 hours (not 2 weeks) to be made instead of trillions years. But the quality will not be better because it take more time to make. In fact, in most case, the lab one will get a better overall quality (better color, less inclusion, bigger size, better clarity).
I'm a certified mineralogist and an analytical chemist technician. I understand that natural stone are rare and therefore more expensive. But since it is basically the same product at the atomic level, I don't understand why people are not massively buying lab stone for penny instead of natural ones for thoussand.
@@alexandrevaliquette1941 Was the ruby made from the earth ?? NO Does it have the same characteristics of a natural stone NO
It is a cheap alternative to the real stone and to fool people to part with their hard earned cash and by a counterfeit. That will in time decrease in value.
Lab stones are not cheap their quite expensive. For someone that works within this industry i am surprised your happy to promote a fake stone which is the complete opposite of what you must have learnt.
@@olive3186 Does a lab ruby have the same characteristics of a natural stone: YES!
"Ruby Crystals produced by the Verneuil process are chemically and physically equivalent to their naturally occurring counterparts, and strong magnification is usually required to distinguish between the two." source wikipedia.
Natural and lab use exactly the same two components: Al2O3 and Chromium Oxyde. Nothing less, nothing more. Please, get educated on "VERNEUIL PROCESS" on WIKIPEDIA.
For info, a lab boule of pure ruby weight around 60g (300carats) and cost under 40$.
The main cost in a lab ruby is the cutting, but it is the same price for cutting a natural ruby.
You might be confuse with the process to make a lab diamond (way more complicated and therefore expensive than the ruby, but still 100% real diamond).
Hindi bhasa me bhi batao
66:L6t
Hi
I have roby if you are interested
i have gems
Can you tell me what a prise of this...plz
अभिषेक प्रताप सिंह Your question is not clear. Price of WHAT?
Price of Rubi
Natural ruby price..... Can u tel me
Yyy
Shi* mine has a scissor cut probably it is synthetic 😢
This should be the same as counterfeiting.its not right it's not moral like a bootleg fake Rolex or Nike shoes.the same penalties should be in place
Penalties for counterfeiting are to protect producers, not consummers like you. Well, Mother nature will claim her patented right and royalties... but wait, patents expires in 20 years, so I think now it's public domain.
Too much theoretical, must be breif and to the point