Star Sapphire Authentication: Identifying Natural vs. Synthetic - Expert Analysis

Question

star sapphire in light I already asked the question about the star sapphire I bought online. I am attaching a photo I took that shows the marks in the stone.

Answer
I would need to exmine the stone under a microscope to test it for characteristic inclusions of both the natural and the synthetic.
Then I would do a spot RI Test and a spectroscope test for absorption spectrum.

Arthur DeMello GG (GIA)
http://www.nationalgemologicallaboratory.com

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