A SUPERB FANCY VIVID BLUE DIAMOND AND DIAMOND RING 5.04卡拉 心形 艷彩藍色 VS2淨度 鑽石 配 鑽石 戒指
PROPERTY OF AN IMPORTANT PRIVATE COLLECTOR
A SUPERB FANCY VIVID BLUE DIAMOND AND DIAMOND RING
5.04卡拉 心形 艷彩藍色 VS2淨度 鑽石 配 鑽石 戒指
Set with a fancy vivid blue heart modified brilliant-cut diamond weighing 5.04 carats, flanked by two pear-shaped diamonds, mounted in platinum, size 4¾.
Accompanied by GIA report no. 12150222, dated 20 February 2020, stating that the diamond is Fancy Vivid Blue, Natural Colour, VS2 Clarity; further accompanied by a diamond type classification letter stating that the diamond is determined to be a Type IIb diamond. Type IIb diamonds are very rare in nature (...less than one half of one percent)...Among famous gem diamonds, the 70.21 carat Idol's Eye and the 45.52 carat Hope are examples of Type IIb.
Accompanied by GIA report no. 12150222, dated 20 February 2020, stating that the diamond is Fancy Vivid Blue, Natural Colour, VS2 Clarity; further accompanied by diamond type classification letter stating that the diamond is determined to be a Type IIb diamond. Please refer to the report and letter for further details.
Metal tested as platinum. Pear-shaped diamonds estimated to weigh approximately 0.75 carats in total, about F-G colour and VS2 clarity, as gauged and graded in the mount.
Signs of minor wear to the metal. Overall 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.Certificates of Authenticity: Various manufacturers may not issue certificates of authenticity upon request. Sotheby's is not under an obligation to furnish the purchaser with a certificate of authenticity from the manufacturer at any time. Unless the requirements for a rescission of the sale under the Terms of Guarantee are satisfied, the failure of a manufacturer to issue a certificate will not constitute grounds to rescind the sale. Gemological Certificates and Reports: References in the catalogue descriptions to certificates or reports issued by gemological laboratories are provided only for the information of bidders, and Sotheby's does not guarantee and accepts no responsibility for the accuracy, terms or information contained in such certificates or reports. Please also note that laboratories may differ in their assessment of a gemstone (including its origin and presence, type and extent of treatments) and their certificates or reports may contain different results.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.
‘…All the colours of flowers and foliage and even the blue sky and the glory of the sunset clouds, only last for a short time, and are subject to continual change, but the sheen and colouration of precious stones are the same to-day as they were thousands of years ago and will be for thousands of years to come. In a world of change, this permanence has a charm of its own that was early appreciated…’ – G.F. Kunz, 1913
Diamonds in essence are pure and simple in composition, requiring only one element as it crystalizes: carbon. However, as nature pressurizes on these very elements deep within the mantles of earth, numerous variables ranging from temperatures to surrounding environments affect the formation process. This is how diamonds obtain their variety in the full colour spectrum, as the structural impurities, inclusions and even radiation exposures allow the crystals to capture a myriad of colours that have been appreciated and treasured throughout the ages.
Among all fancy coloured diamonds, blue diamonds are one of the most famous diamonds throughout history. Early records can be traced back to the 17th century when Jean Baptiste Tavernier sold a dark blue diamond to King Louis XIV of France, which was originally called the Tavernier Blue, and then the French Blue as a part of the French Crown Jewels. Later the mystique of the famed Hope Diamond, which was purchased by Henry Phillip Hope in 1830, was only heightened when research studies showed that the Hope Diamond could potentially have been recut from the lost French Blue.
The distinctive hue of the blue diamonds is often attributed to the trace of boron within the crystal (Type IIb). It could sometimes also be a result of hydrogen (Type Ia) in the structures or even radiation exposures to the diamond, but this is rare and often results in having a greyish tone when graded. Because of its formation, every faceting process of a blue diamond demands extreme care and precision. The rough will likely be asymmetrical with colour zoning, which presents unique challenges to the cutter as they balance the best colour, carat weight and the type of cut for each stone.
Lot 1654 presents a heart-shaped fancy vivid blue diamond of 5.04 carats, which was determined to be a Type IIb diamond. Type IIb diamonds are usually free of nitrogen impurities, with boron in its crystal matrix that gives its stunning blue hue. The famed Hope Diamond is also classified as a Type IIb diamond.
縱觀歷史，在各色彩鑽中當屬藍鑽最為聞名。著名的歐洲珠寶商Jean-Baptiste Tavernier在17世紀將一顆深藍鑽石帶入法國，彼時命名為Tavernier Blue。而後Tavernier將此顆珍寶售予當時法國的國王路易十四，並稱作“法蘭西之藍”，歸為法國皇室珠寶珍藏。1830年，藏家Henry Phillip Hope購得一顆名為『希望之鑽』的藍色鑽石，據稱就是由曾一度消失的“法蘭西之藍”鑽石重新切割而成。
藍鑽無以倫比的顏色通常來自於晶體結構中微量的硼元素，在鑽石類別中屬於Type IIb。但有時藍鑽的顏色也會跟天然輻射或者氫元素的介入有關（Type Ia），但這種情況極為罕有，且鑽石會呈現灰色調。藍鑽原石裡面通常會包涵不對稱的色帶，對於工匠來說是極大的挑戰，切割過程中每一步都極需縝密的規劃和高超技藝，才能在顏色、重量及形狀各方面達到完美平衡的狀態。
此次上拍的Lot 1654是一顆重達5.04克拉的艷彩藍鑽，也是Type IIb鑽石。Type IIb鑽石中一般不含氮元素，鑽石鮮艷迷人的藍色是由晶體結構中的硼元素提供。著名的『希望之鑽』也屬於Type IIb鑽石。