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Four Tools For Gemstone Testing
Quatre outils pour tester les pierres précieuses
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The first thing you need to do is take a class with the GIA. Education is key when it comes to Gemstone testing.Distance Education costs little to start, it just depends on how far you want to go.

As well as taking a course you need to buy this book and treat it as the Gemstone Bible. Gemstone identification made easy by:ANTOINETTE MATLINS, P.G. & A.C. BONANNO, F.G.A., A.S.A., M.G.A. That is a book nobody should be without especially if you’re considering taking GIA classes.

1 Loupe.

It must have a black housing “Case” not chrome or gold since black casing prevents a distorted view as long as you are using a triplet X10 magnifier. If the Loupe is not Triplet you may as well throw it in the trash. A cheap Loupe which does not show the true Gem, shows a distorted view.

One main thing to memorize is “Gemstone Finger printing”. Most gemstones have their very own fingerprint per gem type. Like Peridot - it has what is called a Lilypad inclusion. Many Ceylon Sapphires have a disc-like inclusion referred to as halos. These are small fractures and they are also seen in Garnets.

Four Tools For Gemstone Testing - Loupe

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2 Dark field Loupe

This is another tool – it will attach to a standard maglite and detects the flash effect in filled Diamonds, Rubies, Sapphires and Emeralds stuffed with resin or epoxy. It will show other internal characteristics in gemstones you need when on the road and cannot test.

Four Tools For Gemstone Testing -Dark Field Loupe

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3. Chelsea Filter

A Chelsea filter is very good to have, its used for testing Gems to confirm what something is not. Chelsea were used to seperate Aquamarine and natural zircon but today there are many synthetics that will pass with this tool. It is not as dependable as it once was but it can be used for other colored Gems like telling the difference in real and synthetic Sapphires, Spinels from Sapphires, Aquamarine, Jade from Jadeite (Many confused Gems).

Four Tools For Gemstone Testing - Chelsea Filter

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4. Dichroscope

A costly mistake can be prevented using this tool correctly. Calcite Dichroscope. Make sure you buy this type and not a Polarizing Dichroscope. A Chelsea Filter and Calcite Dichroscope can help many buyers or sellers distinguish one stone from another. A very small tool – dichroscope will show two small blocks at the end of the tube as looking into a stone and show two different colors. Another issue is the user needs to know what colors to look for.
Four Tools For Gemstone Testing - Dichroscope

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So basically those four tools can help to identify gemstones out in the field.

La première chose que vous devez faire est de suivre un cours avec le GIA. L'éducation est la clé en matière de tests de pierres précieuses.

En plus de suivre un cours, vous devez acheter ce livre et le traiter comme la Bible des pierres précieuses. L'identification des pierres précieuses facilitée par: ANTOINETTE MATLINS, PG & AC BONANNO, FGA, ASA, MGA C'est un livre dont personne ne devrait se passer, surtout si vous envisagez de suivre des cours GIA.

1 loupe.

Il doit avoir un boîtier noir "Case" pas chrome ou or car le boîtier noir empêche une vue déformée tant que vous utilisez une loupe triplet X10. Si la Loupe n'est pas Triplet, vous pouvez aussi bien la jeter à la poubelle. Une loupe bon marché qui ne montre pas la vraie gemme, montre une vue déformée.

Une chose principale à mémoriser est «l'impression de doigt de pierre gemme». La plupart des pierres précieuses ont leur propre empreinte digitale par type de gemme. Comme Peridot - il a ce qu'on appelle une inclusion Lilypad. De nombreux saphirs de Ceylan ont une inclusion en forme de disque appelée halos. Ce sont de petites fractures et on les voit également chez les grenats.

Quatre outils pour tester les pierres précieuses - Loupe

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2 Loupe à fond noir

Ceci est un autre outil - il s'attachera à une maglite standard et détectera l'effet flash dans les diamants, rubis, saphirs et émeraudes remplis de résine ou d'époxy. Il montrera d'autres caractéristiques internes dans les pierres précieuses dont vous avez besoin sur la route et ne peut pas tester.

Quatre outils pour tester les pierres précieuses - Loupe de champ sombre

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3. Filtre Chelsea

Un filtre Chelsea est très bon à avoir, il est utilisé pour tester Gems pour confirmer ce que quelque chose n'est pas. Chelsea a été utilisé pour séparer l' aigue - marine et le zircon naturel, mais aujourd'hui, de nombreux synthétiques passeront avec cet outil. Il n'est pas aussi fiable qu'autrefois, mais il peut être utilisé pour d'autres gemmes colorées, comme faire la différence entre les saphirs réels et synthétiques, les spinelles des saphirs, l' aigue - marine , le jade de la jadéite (de nombreuses gemmes confuses).

Quatre outils pour tester les pierres précieuses - Filtre Chelsea

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4. Dichroscope

Une erreur coûteuse peut être évitée en utilisant correctement cet outil. Dichroscope de calcite. Assurez-vous que vous achetez ce type et non un dichroscope polarisant. Un filtre Chelsea et un dichroscope en calcite peuvent aider de nombreux acheteurs ou vendeurs à distinguer une pierre d'une autre. Un très petit outil - le dichroscope montrera deux petits blocs à l'extrémité du tube comme regardant dans une pierre et montrera deux couleurs différentes. Un autre problème est que l'utilisateur doit savoir quelles couleurs rechercher.
Quatre outils pour tester les pierres précieuses - Dichroscope

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Donc, fondamentalement, ces quatre outils peuvent aider à identifier les pierres précieuses sur le terrain.

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commentaires

Mineralhunter

nice article, but i would ask , when you are in a market , is not better to use only refractomer portable and a dark field loupe? with these 2 tools you can easly know the type of gemstone( except diamonds, zircon,sphene) and you can watch the inclusions it s not necessary to have other tools .....
I would ask a question, how does a polariscope portable, funtcion?

14th Aug 2018
Dustyg1

There are a lot of gemology schools besides GIA. There are smaller but very good schools in smaller and larger colleges and universities, and there are other good gemology schools. The ISG has a well respected diploma for about $1,500. Google the words - Free Gemology - and you will get many sites, Barbara Smigel has a nice Intro to Gemology for free, and Gemologyonline com is quite good. Like Jovial1 said, the program called Gemology Tools for about $70 is very worth it, tons of information, even quizzes, you can learn a lot form it. You can study the free courses and sites and learn a lot, you can also take courses and get a certificate, or diploma.

1st Oct 2017
Jovial1

Another handy tool is a decent long wave UV light. The light will cause most synthetic corundum to glow orangy red, and it will cause a good quality Burmese ruby to glow a nice pinky red.  The light can also help to identify many other stones too.
  The best advice here is education, education and more education. With so many different gemstones, the book will be your best collecting partner.  I highly recommend purchasing a copy of Gem Tools Professional software once you are comfortable using your identification tools. Invest in quality tools the first time… or be like me and flunk your gem course until you buy decent tools. :-)  I now have great tools in the shop and a set for the field.

22nd Aug 2017
Admin2

Hi Mason2912, if the 2 frames are filled with different colors it cannot be glass because having 2 frames with different colors indicates a DR gemstone where glass is SR

29th Mar 2017
Mason2912

If the 2 frame in dichroscope are filled with the color of the stone your looking at, does that mean its trulely that type your looking at? Or could it be colored glass?

29th Mar 2017
Gemgirl59

Thanks for that tip…..I bought those tools a while back, so now I can put them to good use!

5th May 2016
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