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Curved Striae in Synthetic Sapphire | by Peter Torraca
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Curved Striae in Synthetic Sapphire

Yesterday, I posted a couple pictures of striae in natural sapphire. Here's a comparison shot of curved striae in synthetic sapphire. Polishing lines can appear curved if the facet size is large enough. But notice how the striae cross the facet junction; this feature is internal and diagnostic of synthetic.

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Taken on February 11, 2012