sapphire

We often recommend that novice gemologists send gems that are difficult to identify to a laboratory for testing. Gemological and mineralogical…

Long known in Chinese culture as a symbol of harmony, eternity, and virtue, jade presents an elegant option for engagement rings. In a time when…

Our gemstone care guide covers many popular gems. Learn how best to maintain your gemstone jewelry and what kinds of stresses and cleaning methods…

Learn how gemologists evaluate color, clarity, cut, and carat for gem grading. Consumers can use this information to find the right stone for their…

How does faceting affect gem value? Unique custom-cut gemstones command high prices. Learn how custom cutting compares to factory cutting.

Disclosing enhancements to gems is a key duty for gemologists. Learn what are the hardest treatments to detect and how to report your findings clearly.…

Discover the complete guide to onyx stone properties, varieties, and care. Learn about black onyx meaning, jewelry uses, and how to identify pure…

With dispersion higher than diamond and sapphire-blue body color, benitoite is one of the most attractive of all rare gems. Gem-quality crystals…

Gem identification is part detective work, part art. Learn how gemologists can distinguish gem species and determine whether a stone is natural…