Search Results

Fine Jewelry University Articles matching: “Crystal opal”

Showing only FJU Article results. Click here to show all results.

Gem in the Spotlight: Iolite

FJU Category: Gemstones | Tags: Colored Gemstones, Folklore, Gem Spotlight, Gemology, Iolite, Jewelry History

…, especially with polarized light. Pleochroism is caused by differing absorption of light rays in doubly refractive crystals. Thus, no singly refractive gemstone can exhibit pleochroism. The process works because of the ability of a gem to … scale, iolite is a somewhat soft gem. It is comparable to quartz (Amethyst, Citrine, etc), a little harder than Opal, and softer than Emerald or Topaz. Because of this, some extra care should be taken with your iolite jewelry. Try to …