Extremely sharp angular growth zoning in a Madagascar sapphire. At times the zoning is so sharp, it created iridescence via diffraction of visible light. This is the same position, but using light field illumination.
Natural Sapphire • Madagascar • Enhancements: None Detected (None) • Lighting Conditions: Diffuse Light Field (Transmitted Light)
Photographer: E. Billie Hughes •
Image Number: A-002-4026-2 • Date Posted: 11 May 2017
Hughes, R.W., Manorotkul, W. et al. (2017) Ruby & Sapphire: A Gemologist's Guide. Bangkok, Lotus Publishing, 816 pp.; RWHL*.