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Golconda Type IIa diamond ring. Centrally set with a cushion shape old mine Golconda Type IIa diamond, E colour, SI1 clarity with a weight of 3.58 carats in an open back claw setting, flanked by eight round old cut diamonds in open back grain settings with a combined weight of 0.08 carats. The total approximate diamond weight is 3.66 carats, to an impressive solitaire design with curving claws, linear open gallery and intricately pierced backholing, flanked to either side with raised open shoulders which terminate to fine ribbed details before flowing to a solid D-shape shank. Tested platinum, circa 1905, accompanied by Gemological Institute of America report #2141498398.
Diamonds are classified by scientists into two main types, depending on the presence of nitrogen in the diamond's chemical makeup. Type II diamonds contain little to no such impurities. This type is further subdivided into two groups, ‘a’ and ‘b’, both of which make up less than two percent of all gem quality diamonds. Type IIa diamonds are extremely rare, and the most pure of all diamonds, and consequently exhibit superior transparency. This type was first identified as coming out of India, namely the Golconda region. Some of the most famous diamonds in the world are Type IIa, including the Koh-i-noor and the Cullinan I.
We are pleased to announce the exciting news that the Berganza showroom is expanding! The showroom has now closed for renovations and will reopen in early September.
Our website will remain active throughout this period. Any items purchased online during this time will be shipped as usual, we offer complimentary shipping both within the UK and internationally. All enquiries will be responded to once the store is open again, we appreciate your patience during this time.
We look forward to welcoming you again soon.
The Team at Berganza