Gemstone Identification

gemology

Ethiopian opal is a hydrated amorphous form of silica, typically containing 3 to 21 percent water by weight. It is known for its vibrant, neon-like color play and relatively lig...

Open article

gemology

Emeralds are beryl colored green by chromium and, in some cases, vanadium; this green hue is the primary identifier used in gemology, retail, and culture. To be regarded as emer...

Open article