• 古墊形天然「馬達加斯加」變色藍寶石重10.40卡拉
• 18K白色黄金鑲嵌

Colour and Clarity: According to Gübelin report, the colour-change sapphire is natural, of Madagascar origin, with no indications of heating. Appendix also states that this sapphire "possesses a high degree of transparency, combined with a very strong colour-change effect". Please refer to the report and appendix for details. In our opinion, this sapphire shows a deep strong blue colour upon daylight, and deep blue-purple upon incandescent lighting, eye clean. Upon 10x loupe, there are only a few tiny crystal inclusions close to side, not seen to naked eyes. Diamonds together weighing approximately 0.90 carat, are about F to G colours, mostly VS clarity. Condition: Karat white gold ring mount, in very good condition.
In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Since we are not professional conservators or restorers, we urge you to consult with a restorer or conservator of your choice who will be better able to provide a detailed, professional report. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective qualified opinion. Illustrations in the catalogue may not be actual size. Prospective purchasers are reminded that, unless the catalogue description specifically states that a stone is natural, we have assumed that some form of treatment may have been used and that such treatment may not be permanent. Our presale estimates reflect this assumption.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING CONDITION OF A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE PRINTED IN THE CATALOGUE.

指環尺寸：6

• 附瑞士Gübelin證書（編號12066047，日期2012年6月6日）• 藍寶石產地為馬達加斯加 • 未經加熱處理
• Gübelin附錄指出變色藍寶石「透亮度極高，有很強的變色效果，日光下呈藍色，黄光下呈紫色。變色藍寶石不但擁有上述出眾的質素，而且份量十足，非常罕有。」