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GIA 4Cs Diamond Blog

GIA 4Cs Diamond Blog

Famous Birthstone: October’s Sun-god Opal

There are three main types of opal: white, black and fire. Some precious opals emit spectral colors from every angle, each one quickly flashing and glowing as bright as the next. This phenomenon is called play-of-color and has enchanted people throughout the ages.

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Opal Buying Guide

October’s birthstone, Opal, displays a unique play-of-color that some say looks like fireworks, lighting, or galaxies trapped inside the stone.  The patterns and colors that result from the stone’s interaction with light make each opal one of a kind. (more…)