23.17 ct Colour-Change Sapphire, Gubelin Certified
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An unmounted colour change sapphire, a cushion-shaped modified brilliant-cut sapphire weighing 23.17 carats., report Verification: Gubelin report no. 17010208, dated 13 February 2017, stating that the sapphire has no indication of heating; and colour-changing from brownish-green (daylight) to yellowish-brown (incandescent light).
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