We learned a new piece of diamond trivia after reading about Katy Perry's engagement ring: a rare diamond called "the Golconda diamond". India's most prized diamonds were known as the "diamonds of Golconda," and some of the most famous Golconda stones include the Hope Diamond.
The term "Golconda diamond" is still used today to indicate very high-quality stones. These diamonds must have a level of transparency and quality found only in rare, chemically/optically pure natural diamonds. The term "Golconda" is also used as a generic term to describe higher quality diamonds with an antique cut.
Cut: Round
Carat: 3
Setting: Vintage on yellow gold band from Cartier.
About this Ring: Estimated to cost $120,000