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Lot 514. A Fine 9.13 carats Ceylon Chrysoberyl Alexandrite and Diamond Ring. Estimate HK$ 570,000 - 670,000 (€62,000 - 73,000). Sold for HK$ 1,125,000 (€121,301). Photo: Bonhams.

The cushion-shaped alexandrite, weighing 9.13 carats, between triangular-cut diamond shoulders, diamonds approximately 1.80 carats total, ring size 4¾

Accompanied by a SSEF report stating that the natural alexandrite changes from Green (daylight) to Purple (incandescent light), has no indications of clarity enhancement and originates from Ceylon (Sri Lanka). Report number 95755, dated 21 September 2017.

Also accompanied by an appendix stating that the natural alexandrite exhibits a remarkable size, combined with a very fine purity and an attractive distinct colour-change. The present 'alexandrite effect' is due to a combination of well-balanced trace elements in this gemstone, typical and characteristic for this attractive variety of chrysoberyl. A natural alexandrite from Ceylon (Sri Lanka) of this size and quality is rare and exceptional. Letter reference number 1087633, dated 4 October 2017.  

Accompanied by an AGL (American Gemological Laboratories) report stating that the natural alexandrite changes from Bluish Green (daylight) to Purplish Pink (incandescent light) colour and originates from Ceylon (Sri Lanka). Report number 1087633, dated 4 October 2017. 

Also accompanied by an AGL special letter stating that the alexandrite of this size and quality is very rare. The alexandrite possesses a very high clarity instilling a superior level of transparency and it displays a marked colour-change effect. The unusual combination of provenance, absence of treatment, prominence and quality of colour-change effect possessed by this gem is exemplary and of top-quality Ceylon material. Alexandrite of this size and quality from one of the world's most important sources is very rare.  

Bonhams. RARE JEWELS & JADEITE, 26 Nov 2017, 14:00 HKT, HONG KONG, ADMIRALTY