inclusions

Measuring “over the limit” (OTL) refractive indices can help distinguish diamonds from simulants. You can do this with a simple upgrade to…

What is the Birthstone for May? The birthstone representing May is emerald, a rich green variety of the diverse beryl gem group which must exhibit…

Gemologists use the hot point test to determine if a piece is a plastic imitation or coated in wax. Learn more about this destructive test here.

With rich cornflower blue Yogo sapphires and fancy-colored gems in any color of the rainbow, Montana sapphires are a great choice for any jewelry…

A favorite color for nature-inspired designs, green gemstones never go out of style. Learn which of these 32 green gems hold up best for engagement…

Appraising rubies is a skill every jeweler and gemologist needs to master. Learn about the different quality factors that can affect ruby prices.…

What is April’s Birthstone? The birthstone representing April is diamond. The vast majority of diamonds are transparent, colorless, and show…

Complete sphalerite buying guide covering grading, quality identification, cutting challenges, pricing factors, and jewelry considerations…

Why do gemology labs sometimes have different gem origin opinions, especially for sapphires? Learn the science and history behind the debate.…