Diamond "Blood" Types

Types of Diamonds

Just like a blood type for humans, diamonds have 4 distinct groups based on their crystalline structure. Type 2a and Type 2b stones are the rarest and usually sought after by connoisseurs and collectors.

Leon Mege diamond blood types

Type 1a - diamonds contain clusters of Nitrogen atoms throughout the crystal structure. Those stones usually display some degree of yellow color. Really nothing to write home about.

Type 1b - diamonds contain singular Nitrogen atoms. These stones are 0.1% of all diamonds with a strong orange, brown, and sometimes green color.

Type 2a -  diamonds lack Nitrogen in their crystal structure. They represent no more than 2% of all-natural diamonds and are the most valuable. Fancy colored type 2a diamonds could be pink or purple. Colorless 2a stones are exceptionally white and are typically traced to the Golconda mine in India.

Type 2b - diamonds contain traces of Boron within the crystal. They are those blue or blue/gray diamonds everyone is craving to collect. They represent only 0.1% of diamonds.

  • Type 1a encompass roughly 98% of natural diamonds. They all have detectable traces of Nitrogen atom clusters. They are the most common type - 98% of all-natural diamonds.
  • Type 2a and Type 2b stones are rare and usually sought after by connoisseurs and collectors.
  • Are all D Flawless diamonds type 2a? Not necessarily, but most likely.
  • Diamond_blood_type_chart_type_2a_diamonds_Leon_Mege.jpg

The Story of Golconda

2,000 years before diamonds were discovered in Brazil and South Africa, the only source of diamonds in the world came from the Indian mines of Golconda. These famous mines are located near present-day Hyderabad and were named for the 14th-century Indian sultanate.

The “Golconda” designation suggests that the stone's origin can be traced all the way back to the historic mine. By the beginning of the 18th century, the mine had exhausted its supply of raw gems.


A disproportionate number of the world's most famous diamonds came from Golconda, some of them are:

  • The 105.6 carats (186 carats before a butchered attempt at re-cutting in 1852) Koh I Noor diamond adorning the Queen Mary’s crown during her 1911 coronation;
  • The  410 carat Regent diamond - one of the last large diamonds to be found in India;
  • The 70 carat Idol's Eye, once paid in ransom by the sultan of Kashmir for the release of Princess Rashidah;
  • The 32 carats Agra once adorned the Mughal emperor Babur’s turban;
  • The 31 carats Wittelsbach, pawned to King Philip IV of Spain for the dowry of the Infanta Margarita Teresa


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