细节
A BLACK OPAL AND DIAMOND RING
The oval cabochon black opal weighing approximately 8.75 carats, within a brilliant-cut diamond trim and a two-tiered overlapping tapered baguette-cut diamond ballerina surround, mounted in platinum, ring size 6¼
Accompanied by report no. 11081018 dated 26 August 2011 from the Gübelin Gemmological Laboratory stating that the 8.75 carat opal is natural dark opal