Lot 3208. Important Color-Change Sapphire, Sri Lanka. Weighing approximately 27.19 carats and measuring 19.0 x 15.6 x 10.19mm. Estimate US$ 120,000 - 150,000 (€ 100,000 - 130,000). © Bonhams 2001-2018

A lovely, unenhanced color-change sapphire with excellent clarity, this "old world" stone exhibits a change of color when viewed under daylight or fluorescent vs. incandescent light. Its large size combined with the prestigious locality and high degree of clarity make this stone an excellent choice for the knowledgeable collector. *

Accompanied by a A.E. Thomas, South Africa, Gemstone report AT11376 stating that the natural sapphire is a color change blue-purple stone with typical Sri Lankan inclusions.  

Bonhams. THE WORLD OF GOLD, OPALS AND OTHER "PHENOMENAL" GEMS, 15 May 2018, 10:00 PDT, LOS ANGELES