Our 3 year commitment.
Most lab grown diamond brands publish a sustainability claim and stop there. We are committing to a 3 year programme with dated milestones, quarterly reviews, and third party verification by 2029. Honest about what we know, honest about what we are still chasing.
A public commitment with dated milestones. Quarterly reviews. A path to third party verification by 2029. Updated each quarter as the data improves.
The seven pillars we work through
Industry frameworks for sustainable jewellery assess brands across seven distinct pillars. We work through all of them, openly, with different levels of data on each today.
Supply chain transparency
Twelve data points recorded against every stone and piece. Country of growth, growth method, energy declared, cut location, grading lab, chain of custody, metal source, hallmark and workshop location. The pillar we are strongest on today.
Circular materials
Recycled gold by default where available from our refiners. Free resizing for life on every Luma piece. A formal take back programme follows in year two.
Labour and community
Pieces made by people in Hatton Garden, paid above the London Living Wage. A supplier code of conduct publishes in 2026. Audited partner data from 2027.
Carbon and energy
Energy mix declared by each growing facility where shared. We are commissioning our operational carbon footprint with a UK verifier in year one. Science based targets follow in year two.
Water and chemicals
Wholesale partner survey on facility level water and chemicals data from year two. We are honest about the difficulty of auditing facilities we do not own.
Biodiversity
No mining means minimal direct biodiversity impact. We will measure indirect impact through suppliers as part of the year three review.
Third party verification
Self declaration is not enough for credible sustainability. By 2029 we will have engaged an external auditor to verify every pillar above. The pillar this entire commitment leads to, and the one that gives every other pillar its weight.
What we verify, and what we cannot yet
Industry bodies score sustainability claims on a tiered evidence hierarchy. Verified by a third party scores full marks. Stated on a website without backing scores zero. Most of what we have today sits in the middle, and the 3 year commitment is the path to move what is recorded into the verified column.
Verified today
IGI or GIA grading certificate, shared with you on every order
UK hallmark at the London Assay Office on every applicable piece
Workshop location for bespoke pieces, which you can visit
Stated, not yet independently verified
Country of growth, growth method and energy mix declared by suppliers
Cut and polish country, recorded from supplier declaration
Recycled vs new gold, recorded from refiner declaration
Cannot verify today, year 3 work
Energy mix data for growing facilities we have no direct relationship with
Labour conditions at every step of the chain
Water and chemicals data at supplier facility level
Every brand at our size has these gaps. Most do not publish them. We do, because the only way the standard rises is if someone shows the work openly.
The 3 year path to verification
A public programme with quarterly reviews and dated milestones. By 2029 every pillar will be under third party review.
June 2026
Begin recording data across all seven pillars. Supplier code of conduct published.
May 2027
Year one report. Carbon footprint commissioned with a UK verifier. First broad picture across the pillars.
May 2028
Year two report. First third party certification cycle begins. Labour and community data formally captured.
2029
Third party verified transparency report. Every pillar under audit. The commitment delivered.
Why we make lab grown diamonds
Lab grown diamonds are chemically, optically and physically identical to mined diamonds. They are graded by the same laboratories, cut the same way, set the same way, and last the same number of generations. Our reasons for choosing lab grown are practical, not ideological.
More diamond for your budget
A 2,500 pound budget that buys a 0.5 carat mined diamond comfortably buys a 1 carat lab grown ring at similar grade.
Shorter supply chain
A typical mined diamond passes through five to seven hands between mine and ring. A lab grown stone typically passes through two or three.
Cleaner data trail
Growth facilities can publish energy mix data. Mine sites can rarely publish equivalent figures with the same precision.
We do not claim that lab grown is environmentally superior to mined. The honest answer is that it depends on the energy mix at the specific facility, the cutting location, and the shipping route. Anyone making blanket carbon claims is overreaching.
Honest about what we know, honest about what we are still chasing. That is the only version of fine jewellery worth selling.
Asher Wiener and Amir Sharabi, Co-founders of Luma Jewellery
Talk to us about a stone
If you have questions about a specific stone or the wider commitment, ask us. We will tell you what we know, what we are still chasing, and what we cannot yet verify. The conversation is the point.