This sapphire contained several platey metallic crystals. While we were not able to get a conclusive match on this particular crystal, one of the other crystals in the stone that was cut through on the surface was a good match for graphite, suggesting that this crystal might be graphite as well.
Natural Sapphire • Sri Lanka (Ceylon) • Enhancements: None Detected (None) • Lighting Conditions: Dark Field + Diffuse Fiber Optic
Photographer: E. Billie Hughes •
Image Number: A-003-6536-1 • Field of View = 2 mm • Date Posted: 09 July 2020
Hughes, R.W., Manorotkul, W. and Hughes, E.B. (2017) Ruby & Sapphire: A Gemologist's Guide. Bangkok, Lotus Publishing, 816 pp.; RWHL*.
Gübelin, E.J. and Koivula, J.I. (2008) Photoatlas of Inclusions in Gemstones, Volume 3. Basel, Switzerland, Opinio Publishers, 672 pp.; RWHL*.