A Diamond Single-Stone Ring


The step-cut diamond, weighing 6.03 carats, between baguette-cut diamond shoulders, to a similarly cut diamond gallery, signed, ring size 4¾
|Accompanied by a GIA report stating that the diamond is D colour and Flawless clarity, with Excellent Polish and Symmetry. Report number 2171773330, dated 14 March 2018.Also accompanied by an appendix from GIA stating that the diamond is Type IIa and therefore chemically pure, dated 13 March 2018.6.03克拉天然D色無瑕淨度Type IIa鑽石配鑽石戒指戒指尺寸4¾,附GIA證書及附件A D Flawless diamond is a true rarity in what is already a rarefied world. With fewer than 20% of all diamonds mined worldwide being of high enough quality to be used in jewellery, only a select few of these are of the whitest D colour and of these, even fewer have no internal or external inclusions, flaws or blemishes which allow them to be classified as Flawless. Diamonds are classified into two groups based on the relative presence or absence of nitrogen. Type I diamonds contain nitrogen while Type II diamonds contain little if any nitrogen and are considered to be chemically pure. Type IIa diamonds make up less than 2% of all natural diamonds and show exceptional transparency. Type IIa diamonds were first identified as originating from India – specifically from the fabled Golconda region – but have since been found across the world. Many famous diamonds such as the Cullinan and the Koh-i-Noor are Type IIa diamonds. D色無瑕鑽石在珍罕的鑽石世界中實屬彌足珍貴。全世界開採的鑽石中，只有不到20％是可應用於珠寶的寶石級品質，其中僅有一小部分是無色的D色，而在這其中，只有甚小一部分是完全沒有內部及外部瑕疵，而可以達到無瑕淨度級別。根據鑽石中氮元素的存在與否，鑽石被分為兩種類型：Type I鑽石含有氮元素，而Type II鑽石完全不含或幾乎不含氮元素，是化學上最純淨的鑽石。Type IIa鑽石僅佔所有天然鑽石比例不到2%，有着格外明 亮的透徹度。 Type IIa鑽石最早被發現於印度—傳奇的戈爾康達地區，後來出現於世界各地。 許多著名的鑽石如Cullinan及Koh-i-Noor都是Type IIa鑽石。