Gemart Services

Green Obsidian

Here is the "Octagon Ultimatum" cut to compare optical performance to the other two stones cut recently in this new pattern, the YAG and the Green Topaz. Optical performance is excellent which shows that the new pattern works well on materials of very different Refractive Index: YAG 1.83, Topaz 1.63, Obsidian 1.51

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