Ultraviolet Testing and Gemstone Identification
Ultraviolet testing can be crucial for gemstone identification. Learn the basics of this technique as well as how to make your own UV viewing box.…
Ultraviolet testing can be crucial for gemstone identification. Learn the basics of this technique as well as how to make your own UV viewing box.…
Word is out that diamonds aren’t that rare. So, why are they still so expensive? Learn about diamond rarity and quality and how they impact cost.…
Do white sapphires make good alternatives to diamonds? Compare their qualities and learn how to choose the right engagement ring stone for you.…
We often recommend that novice gemologists send gems that are difficult to identify to a laboratory for testing. Gemological and mineralogical…
Hot point testing can determine if some gem materials are plastic imitations. It can also reveal if a stone is treated with wax or plastic. By Donald…
Although gemstone magnetism isn’t a commonly tested gemstone property, it may be useful for making quick separations outside the lab. By Richard…
Step 3: Practical Gemology Lesson 10 Back to syllabus Getting accurate readings when testing gemstone specific gravity is critical. If you make…
Gemstone identification typically starts with measuring a specimen’s refractive index (RI) and specific gravity (SG). These two tests…
A gemologist can conduct many different tests with a polariscope. Gemstone twinning, dichroism, and internal crystal strain are some of the properties …