20.3克拉D色长方形切割钻石,净度内外无暇,极优评及级对称及打磨,无莹光反应附GIA证书及Type IIa附加信 Accompanied by GIA report dated 09 July 2018 stating that the 20.3 carat is D color, flawless clarity, with excellent polish, and excellent symmetry, none fluorescenceAlso accompanied by a GIA diamond type classification report stating that the 20.3 carat emerald-cut diamond is determined to be a Type IIa diamond. Type IIa diamonds are the most chemically pure type of diamond and often have exceptional optical transparency所有的自然鑽石都在地球深處結晶,但並非所有的鑽石都擁有相同品質。鑽石當中Type I型號是最常見的,大概98%的鑽石都屬於此類,其特點是含有微量的氮原子。另外2%的鑽石屬於Type II類型,不含有氮原子,因而顯得格外明亮透徹。Type II也分為a和b兩種子類別,Type IIb含有微量硼原子,而Type IIa不含有任何可見的其它元素原子置換碳原子,正如這一枚鑽石,它以最大的限度释放鑽石無以倫比的光學性能,反射周圍所有角度的色彩和光芒,锐利明亮,亮度奪目,火彩明媚,充滿活力和生命力。