RECYCLED DIAMONDS VS LAB-GROWN: WHICH ARE MORE SUSTAINABLE?
The lab-grown diamond category has exploded on the consumer market over the past decade, positioning itself as an eco-friendly, sustainable alternative to natural diamonds. But are lab-grown diamonds truly a more sustainable option than recycled natural diamonds? The answer may surprise you.
THE HIDDEN ENERGY COST OF LAB-GROWN DIAMONDS
Lab-grown diamond producers market their products as less harmful to the environment than mining — pointing to reduced water use, fewer greenhouse gas emissions, and no earth disruption. Yet they speak little of the enormous energy required to grow diamonds in the first place.
THE PRODUCTION PROCESSES
Diamonds are grown in factories using High Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD) processes. Both require uninterrupted power sources for production cycles that can take anywhere from 30 minutes to several weeks.
STAGGERING ENERGY USE
The most efficient diamond growers use 250 kWh per carat — equivalent to the electricity an average U.S. household uses in eight days, or enough to fully charge a Tesla two-and-a-half times. Most producers use 750 kWh per carat.
COAL-POWERED PRODUCTION
Most lab-grown diamonds come from regions where renewable energy is rare. In China, which dominates HPHT production, at least half of all energy comes from coal. In India the proportion is even greater. Few producers are certified sustainable or carbon-neutral.
THE CASE FOR RECYCLED NATURAL DIAMONDS
By recycling diamonds, the jewelry industry allows the flow of second-hand natural diamonds back into meaningful production — averting the need for new mining and avoiding the energy cost of growing diamonds in a factory.
MINIMAL REPROCESSING NEEDED
According to White Pine CEO Benjamin Burne, about 25–30% of recycled natural diamonds require no remanufacturing whatsoever to re-enter the market. For those that are recut, the process requires far less energy than either mining or growing diamonds from scratch.
A COMPELLING STORY FOR CONSUMERS
Younger consumers are very comfortable recycling and buying second-hand. "Buying a piece of jewelry with a recycled stone has a potentially strong appeal to next-generation consumers who are environmentally and sustainably conscious," jewelry industry expert Ben Janowski told Forbes. "There is added value and meaning in a recycled stone."
SUSTAINABILITY IS KEY IN DIAMOND PURCHASES
Research consistently shows that sustainability is no longer a secondary consideration — for many consumers it drives the purchase decision entirely.
84% PREFER NATURAL
An overwhelming 84% of consumers say they prefer natural diamonds over lab-grown, particularly for important life celebrations, according to The Plumb Club Industry & Market Insights 2021 Report surveying over 1,000 U.S. jewelry consumers.
TOP PURCHASING FACTOR
Sustainability ranks above price and design in choosing a natural diamond for nearly a third of consumers, and on par with brand reputation and quality, according to De Beers' 2021 Diamond Insight Report studying over 8,400 consumers across seven global markets.
59% OF MILLENNIALS
Given a choice between a sustainable natural diamond and one with no sustainability assurance, 59% of older Millennials will choose the sustainable option, according to De Beers Insights — a figure that will only grow as Gen Z matures into the market.
62% FOR WEDDINGS
62% of people buying natural diamonds for weddings, engagements, and anniversaries rate sustainability factors as the most important consideration in their purchasing decision — making sustainability messaging a powerful part of any brand's consumer engagement.
A SUSTAINABLE SUPPLY SOURCE FOR THE FUTURE
MINING IS DECLINING
Natural diamond mining is expected to decline significantly — several mines currently supplying 29 million carats annually will be fully depleted by 2030, according to Bain & Co. Global economic and social instabilities further challenge supply, making recycled diamonds a sustainable source in multiple senses of the word.
AN ABUNDANT DOMESTIC SUPPLY
The U.S. has been the world's largest importer of polished diamonds for at least 50 years, according to Martin Rapaport, chairman of The Rapaport Group — representing an enormous domestic reservoir of pre-owned polished natural diamonds waiting to re-enter the market through recycling.
THE MOST SUSTAINABLE DIAMOND IS ONE THAT ALREADY EXISTS
Recycled diamonds celebrate the endurance of a forever gem — the strongest mineral on earth, reused without trace of wear, with sustained value as a finite and precious natural resource. Compared to lab-grown diamonds, recycled natural diamonds fulfill the full value proposition that natural diamonds deliver — for both the planet and the buyer.
