View full screen - View 1 of Lot 317. Ruby and Diamond Ring | 天然「坦桑尼亞」未經加熱紅寶石 配 鑽石 戒指(紅寶石重約10.01克拉).
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Ruby and Diamond Ring | 天然「坦桑尼亞」未經加熱紅寶石 配 鑽石 戒指(紅寶石重約10.01克拉)

Ruby and Diamond Ring | 天然「坦桑尼亞」未經加熱紅寶石 配 鑽石 戒指(紅寶石重約10.01克拉)

Ruby and Diamond Ring | 天然「坦桑尼亞」未經加熱紅寶石 配 鑽石 戒指(紅寶石重約10.01克拉)

Set with a cushion-shaped ruby weighing approximately 10.01 carats, decorated with baguette and brilliant-cut diamonds, mounted in 18 karat white gold, size 5¾.


Accompanied by Gübelin report, appendix and information sheet no. 22040102, dated 5 May 2022, stating that the ruby is of Tanzanian origin, with no indications of heating. Gübelin appendix further stating that 'The natural ruby described ... is ...from Winza. It has a saturated and homogeneous colour, combined with a high degree of transparency... has been spared thermal treatment. Such a combination of characteristics is rare in natural rubies of this size.'


Also accompanied by SSEF report no. 122193, dated 25 April 2022, stating that the ruby is of Winza, Tanzanian origin, with no indications of heating. 

Accompanied by Gübelin report, appendix and information sheet no. 22040102, dated 5 May 2022, stating that the ruby is of Tanzanian origin, with no indications of heating. Gübelin appendix further stating that 'The natural ruby described ... is ...from Winza. It has a saturated and homogeneous colour, combined with a high degree of transparency... has been spared thermal treatment. Such a combination of characteristics is rare in natural rubies of this size.' Also accompanied by SSEF report no. 122193, dated 25 April 2022, stating that the ruby is of Winza, Tanzanian origin, with no indications of heating. Please refer to the reports, appendix and information sheet for further details. Stamped 750 for 18 karat white gold. Ruby is of medium red colour and strong saturation, with typical inclusions, some to the surface, some abrasions. Diamonds are bright and lively. Overall in very good condition.


The lot is sold in the condition it is in at the time of sale. The online condition report is provided to assist you with assessing the condition of the lot and is for guidance purposes only. The images of the lot also form part of the online condition report for the lot provided by Sotheby's. Any reference to condition in the online condition report does not amount to a full description of condition. The online condition report may make reference to particular imperfections of the lot but you should note that the lot may have other faults not expressly referred to in the online condition report of the lot or shown in the online images of the lot. The online condition report may not refer to all faults, restoration, alteration or adaptation because Sotheby's is not a professional conservator or restorer but rather the online condition report is a statement of subjective, qualified opinion genuinely held by Sotheby's (for example, information regarding colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's). Please also note that we do not guarantee, and are not responsible for, any certificate from a gemological laboratory that may accompany the lot. In addition, certain images of the lot provided online may not accurately reflect the actual condition of the lot (for example, the online images may represent colours and shades which are different to the lot's actual colour and shades). For these reasons, the online condition report is not an alternative to taking your own professional advice regarding the condition of the lot. Prospective buyers should also refer to the relevant section the Buying at Auction guide which includes important notices concerning the type of property in this sale. NOTWITHSTANDING THIS ONLINE CONDITION REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF SALE/BUSINESS APPLICABLE TO THE RESPECTIVE SALE.

Rubies from Tanzania were first discovered in the early 20th century near Longido, in the northern part of the country. During the 1960s more corundum deposits were found near the Kenyan border in the Umba river valley. Historically these sources were known to originate mostly cabochon-quality pieces, with only a few exceptional quality stones. Therefore, when high-quality rubies were found in Winza in the late 2000s from both eluvial and primary deposits, it was welcomed by the market as a pleasant surprise. The location is close to the capital city of Dodoma and next to Mahenge, which produces the famous Mahenge spinels with a vibrant pinkish-red colour to the market. Being close to the Mozambique belt that produces high-quality rubies, with the best of Winza rubies characterized by exceptional colour and size, Tanzania has become a new source for fine rubies. This ring is accompanied by a Gubelin appendix explaining Tanzanian rubies, stating that the ruby graded has a ‘saturated and homogenous color, combined with a high degree of transparency…such as combination of characteristics is rare in natural rubies of this size.’