Spinel

Measuring specific gravity helps gemologists identify gemstones. The following table lists the specific gravity values for a variety of gem…

If you’re trying to create an ethical engagement ring, you have some research ahead. Our guide can help you shop for ethically sourced gemstones…

How do you make money investing in gems? What should you buy, for how much, and how can you add value to your investments? Learn these top 5 rules.

Thinking of becoming a gemologist? Consider these gemology career options, compare their estimated salaries, and decide which one may be right…

The Mistress gem design by Jeff Graham looks like a princess cut but works well with light-colored stones. Learn more about this design for novice…

Refractive indices and double refraction (birefringence) help gemologists identify gems. The following table lists these values for selected…

Inspired by the classic children’s toy, Jeff Graham’s award-winning Pin Wheel gem design is easy to cut and makes a very interesting stone.…

Take a look at these before-and-after pics of repaired and recut gems and learn how a great lapidary can improve the value of many types of gems.

Finding your path to success in the gem trade takes introspection, education, and exploration. Learn about your options for entering this tight-knit…