The Journal
Why Type IIa is the purest diamond
24 June 2026The Atelier
The grade behind the brilliance, explained.
Type IIa diamonds contain almost no nitrogen, which makes them chemically the purest category of diamond — and the most transparent to light.
What it means for you
A purer crystal means fewer interruptions to a ray of light as it travels through the stone. The result is an exceptional, icy brilliance.