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8587 6克拉天然足色无瑕（IF）Type IIA钻石配钻石戒指

6克拉天然足色无瑕（IF）Type IIA钻石配钻石戒指
拍品信息
LOT号 8587 作品名称 6克拉天然足色无瑕（IF）Type IIA钻石配钻石戒指
作者 -- 尺寸 -- 创作年代 --
估价 3,000,000-3,800,000 成交价 RMB 3,450,000
材质 形制


18K白金镶嵌6克拉天然D色IF净度Type IIA钻石配钻石戒指。TYPE IIA钻石全球钻石产量不到2%，与著名的530.20克拉库里南一号钻石同属一类，是世界上最纯净的钻石。极优的抛光与切工，最大程度的展现出耀眼火彩。
附GIA证书及TYPE IIA证书
美国宝石学院GIA编号7131992192报告，鉴定6.00克拉梨形明亮式切割主石为钻石，颜色D，净度INTERNALLY FLAWLESS无瑕，2012年9月12日
美国宝石学院GIA TYPE IIA证书编号7131992192报告，鉴定6.00克拉梨形明亮式切割主石为TYPE IIA钻石
DIAMOND TYPE CLASSIFICATION FOR GIA DIAMOND GRADING REPORT #7131992192
SCIENTISTS CLASSIFY DIAMONDS INTO TWO MAIN ‘’TYPES” – TYPE I AND TYPE II – BASED ON THE PRESENCE OR ABSENCE OF NITROGEN WHICH CAN REPLACE CARBON ATOMS IN A DIAMOND’S ATOMIC STRUCTURE. THESE TWO DIAMOND TYPES CAN BE DISTINGGULSHED ON THE BASIS OF DIFFERENCES IN THEIR CHEMICAL AND PHYSICAL PROPERTIES. TYPE II DIAMONDS CONTAIN LITTLE IF ANY NITROGEN AND THEY ARE SUBDIVIDED INTO TWO GROUPS （IIA AND IIB） BOTH OF WHICH ARE QUITE RARE （LESS THAN 2% OF ALL GEM DIAMONDS）
ACCORDING TO THE RECORDS OF THE GIA LABORATORY， THE 6 CARAT pear CUT DIAMOND DESCRIBED IN GIA DIAMOND GRADING REPORT #7131992192 HAS BEEN DETERMINED TO BE A TYPE IIA DIAMOND. TYPE IIA DIAMONDS ARE THE MOST CHEMICALLY PURE TYPE OF DIAMOND AND OFTEN HAVE EXCEPTIONAL OPTICAL TRANSPARENCY. TYPE IIA DIAMONDS WERE FIRST IDENTIFIED AS ORIGINATING FROM INDIA （PARTICULARLY FROM THE GOLCONDA REGION） BUT HAVE SINCE BEEN RECOVERED IN ALL MAJOR DIAMOND-PRODUCING REGIONS OF THE WORLD
AMONG FAMOUS GEM DIAMONDS， THE 530.20 CARAT CULLINAN AND THE 105.60 CARAT KOH-I-NOOR ARE EXAMPLES OF TYPE IIA
主石尺寸约为17.36×13.40×3.94mm，指环大小13