Type IIa diamonds are the most valued and the purest type of diamonds. They contain either very little or no nitrogen atoms in the crystal structure. White stones are exceptionally colorless and fancy colored diamonds are often found with a brown, purple, blue, or pink tone. They represent only 1% - 2% of all mined diamonds in the world.
In the world of mined diamonds, Type IIa are so rare that they command a 5% to 15% premium, when they can be found.
One of the most well-known examples is the “Elizabeth Taylor Diamond” (formerly known as the “Krupp Diamond”), a 33.19-carat Type IIA diamond.
Purchased for $300,000 in 1968 by Richard Burton, the ring became one Elizabeth Taylor’s most cherished white diamonds; one she wore nearly every day. Of the ring, she once said, “[It] gives me the strangest feeling for beauty. With its sparks of red and white and blue and purple, and on and on, really, it sort of hums with its own beatific life.” The Asscher-cut diamond ring recently sold at auction for a whopping $8.8 million.
Other iconic historic Type IIa diamonds include the Koh-I-Noor, Darya-I-Noor, the Archduke Joseph, the Regent, the Agra, The Star of the South, The Winston legacy and the Beau Sancy. Type IIa diamonds also have a famous historic connection with Golconda diamonds mined from the historic Kingdom of Golconda in India.
Type IIa and connection with Golconda Diamonds.
A Golconda diamond is a diamond from a specific geographic area within the historic Kingdom of Golconda in India. Diamonds with proven Golconda provenance are of a specific type of rare, pure carbon diamond known as Type IIa. Less than 1-2% of the world's diamonds are Type IIa.
The kingdom of Golconda is situated in India's Deccan plateau. Golconda was a region located between the lower reaches of the Godavari, Wainganga, Wardha and Krishna-Venva rivers, in the present-day states of Maharashtra and Andhra Pradesh, central India.
Golconda Diamonds: Rahul Kadakia, Department Head, Jewelry, Christie's Americas, describes these very special and rare diamonds. (2005) (RT 3:13)