A black uraninite crystal with stress halo due to radiation is a common inclusion in Sri Lanka sapphire. Rutile silk is also visible below.
Natural Sapphire • Sri Lanka (Ceylon) • Enhancements: None Detected (None) • Lighting Conditions: Fiber Optic: Oblique
Photographer: E. Billie Hughes •
Image Number: A-001-0506-2 • Date Posted: 24 February 2015
Gübelin, E.J. (1973) Internal World of Gemstones. Zürich, ABC Verlag, reprinted 1983, 234 pp.; RWHL*.
Gübelin, E.J. and Koivula, J.I. (2005) Photoatlas of Inclusions in Gemstones, Volume 3. Basel, Switzerland, Opinio Publishers, 672 pp.; RWHL*.