A Fine Alexandrite Chrysoberyl and Diamond Ring


The oval-cut alexandrite chrysoberyl, weighing 5.31 carats, between half moon-shaped diamond shoulders, diamonds approximately 1.00 carat total, ring size 6
|Accompanied by an AGL (American Gemological Laboratories) report stating that the alexandrite chysoberyl displays no gemological evidence of enhancements/treatments and originates from Brazil.Report number CS44043 dated 15 March 2011.Accompanied by a Gubelin report stating that the alexandrite chrysoberyl changes from Bluish-Green to Purple colour, has no indications of treatment and originates from Brazil. Report number 15105148, dated 26 October 2015.Also accompanied by a Gubelin appendix stating that the alexandrite chrysoberyl possesses a very high degree of transparency, combined with a very strong colour-change effect. The combination of high clarity and pronounced colour-change effect in a Brazilian alexandrite of this size is rare.5.31克拉天然無經加熱處理巴西亞歷山大石配鑽石戒指鑽石共重約1.00克拉,戒指尺寸6,附AGL證書,Gubelin證書及附件 AlexandriteFirst discovered in the Ural Mountains in Western Russia in the 1830s, this exceptionally-rare colour-changing stone was named in honour of the future Czar of Russia Alexander II, and is now found in other geographical locations including Brazil, Sri Lanka and East Africa. Judged on the richness of the colour-change, the finest examples are unheated and turn green to bluish-green in natural daylight and a striking red to purplish-red in incandescent light.亞歷山大石這種極為珍稀的變色寶石最先在1830年代於俄羅斯西部的烏拉爾山脈中被發現，當時以紀念未來的俄羅斯亞歷山大二世沙皇而命名， 現於巴西，斯里蘭卡和東非等其他地區也有出產。 從色彩變化的豐富程度來看，最優質的是寶石沒有經過加熱， 顏色在自然光下是綠色到藍綠色，而在白熾燈光下是紅色到紫紅色。