An extraordinary 18.75 carat golden black Star Sapphire exhibiting a rare and well-defined 12-ray asterism. Expertly cut in a high-domed oval cabochon, this gem is among the largest of its kind, combining mystical allure with exceptional mineralogical rarity. A true collector's masterpiece currently in Luminvault private vault collection.
Fully certified for authenticity and quality, comes with a sensory experience that you won't forget. Don't miss your chance to own this stunning piece of earth wonder.
Star Sapphire 12 Rays Golden Black Oval Cabochon 18.75 CT | Flawless
GEM STATS CHEMICAL FORMULA Aluminium oxide, Al2O3 COLOR Gold, Black WEIGHT
18.75 Ct SHAPE AND CUT Cabochon REFRACTIVE INDEX nω = 1.768–1.772
nε = 1.760–1.763GRADE Flawless Mohs scale 9 LUSTRE Vitreous TRANSPARENCY Opaque ORIGIN Thailand TREATMENT Natural
























