Lab-Grown · Certified
Light,
cultivated by
the carat.
HOWDEN cultivates lab-grown diamonds of exceptional clarity and fire. Each stone independently graded, offered loose, ready for the setting of your choosing.
Cultivated, Not Mined
Each diamond is grown in a controlled environment, chemically and optically identical to mined, with origins fully traceable.
Independently Certified
Every stone above 0.30 ct ships with an IGI or GIA grading report covering the 4Cs and full optical proportions.
Loose, by the Carat
Solitaires and melee, sold loose and ready to be set by the jeweller of your choosing. No house mark-up on settings.
“The certification, the packaging, the conversation, everything felt considered. The stone arrived exactly as described.”, Eleanor M. · 1.62ct Round Brilliant
Just Cut
The Diamonds
In the vault
New stones are being graded.
The House
Cultivated stones. Considered selection.
We curate a small inventory of certified lab-grown diamonds, each one hand-selected for cut, brilliance and proportion. No two stones in the vault grade the same — and we hold each to a standard we would choose for ourselves.
Our sourcing standards