Type IIa Diamond
The "Golconda" Purity Standard
Key Takeaway: Type IIa diamonds have no measurable nitrogen or boron impurities. They are
the purest form of carbon crystal, representing less than 2% of natural diamonds but nearly 100% of
high-quality lab diamonds.
Why Type IIa Matters
Nitrogen gives diamonds a yellow tint (Type Ia). Boron gives a blue tint (Type IIb). Type IIa diamonds lack
both, resulting in exceptional optical transparency and heat conductivity.
Natural vs. Lab Grown
- Natural: Extremely rare. Famous examples include the Cullinan and Koh-i-Noor.
- Lab Grown: Standard. Because we control the gas mixture in the CVD reactor, we
specifically exclude nitrogen, making almost all high-quality lab diamonds Type IIa by default.
Identification
Gemological labs (IGI, GIA) use infrared spectroscopy to determine diamond type. On your IGI report, look
for the comment: "Type IIa".
Sourcing Type IIa Diamonds?
All Kunlun Growth diamonds are guaranteed Type IIa.
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