Sri Lankan Sapphire with Spinel Inclusions
Photomicrograph by C.P. Smith; magnified 32x.
The inclusion scene in this sapphire is dominated by two octahedral colourless crystals that were identified by Raman spectroscopy as spinel.
The article detailing the research was published in the Journal of Gemmology, Vol 36, No 4, 2018. pp 291.
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