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Showing all results for: “What is ray”
Fine Jewelry University
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Gem in the Spotlight: Iolite
… color of the stone when it was first discovered. Coming in at 7 to 7.5 on the Mohs hardness 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 … at different angles, 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 …
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The Magic of Polarized Light
… polarized light on a daily basis when we put on our sunglasses, turn on our TV, or sit down at our computer. But, what is polarized light exactly, and why is my jeweler writing about it? It turns out that polarized light is actually a … a stone is doubly refractive or not you can use that information to narrow down the list of possible candidates of what the stone could be. A great example of this phenomenon can be seen when looking at the facet junctions on a …
