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There are two categories of opals - common and precious. The Precious opals are composed of three groups: white/ black/ fire.

Quartz gemscape sculpture. In most gems inclusions are perceived as flaws, but sometimes they can grace them with extra beauty or an interesting geological story. These are known as scenic inclusions and are now highly sought after, though they were routinely discarded not that long ago. This sculpture of quartz with natural inclusions of green chlorite and a red mineral, possibly hematite, was created by gem artist Lawrence Stoller. Image credit: Lawrence Stoller…