Golconda type IIa diamond solitaire ring. Set to centre with a Golconda type IIa round old cut diamond, F colour, VS1 clarity, with a weight of 1.23 carats, in an open back claw setting, to an elegant solitaire design featuring curving claws, an intricately pierced gallery and open backholing, leading to inwardly shoulders with chenier detail and flowing through to a solid D-shape shank. Marked 18 carat gold and platinum, circa 1910, accompanied by Gemological Institute of America (GIA) report #2235193753.

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.