Industry Analysis

Laboratory-Grown Diamonds: Demand Rises, Prices Fall

Cushion cut synthetic diamond
This 5.19 ct near-colourless type IIa CVD synthetic diamond is one of the largest faceted CVD synthetics seen at GIA. GIA photo

The proliferation of laboratory-grown diamonds into the market continues to dominate industry news.

A new report says demand for lab-grown diamonds has experienced “significant growth” from attractive marketing, but that prices for such goods have declined 70% in the past two years. The report, compiled by Bain & Co. and published by Rapaport, says the price decline is caused by improving technology that has lowered production costs.

The consulting firm also noted that its consumer survey found that demand for lab-grown diamonds falls sharply when their price tops $1,000 (£750) per carat.

Lab-grown producers, other than De Beers/Lightbox, claimed in the report that demand is higher than supply for their products, so prices are not dropping – especially for larger stones that remain difficult to produce.

The Bain view, however, is that prices will probably continue to decline to the point where the two markets “separate themselves”, similar to what happened with coloured stones.


The world’s two largest diamond miners – De Beers and Alrosa – continued cautious supply policies into the first third of the year. Both cut back on rough sales compared to last year, as their clients – diamond manufacturers – complained of softening prices and rising stocks, especially of small, lower quality goods.

The De Beers February/March cycle totalled $490 million (£370 million), a 13% decline on the same period last year, but the company held firm on prices after lowering them on some goods last autumn. The trade generally welcomed the lower allocations, which include sight sales and individual deals, but claimed that reduced polished prices have cut margins.

De Beers production also fell by about 10% in 2018 – 32 million carats compared to 35 million carats in 2017 – although revenues increased by 4% as the company shifted more of its sales towards higher quality goods.

De Beers noted: “The outlook for 2019 global diamond jewellery consumer demand faces a number of headwinds, including the risk of a potential intensification of US-China trade tensions, the Chinese government’s ability to rebalance economic growth towards consumption, and further exchange rate volatility.”

Alrosa announced that its February rough sales were $340.6 million (£256.8 million), up 23% over its January allocation. While the headline stated it was an increase, sales for the first two months of the year were more than 35% below the same period of 2017. The company did note improving demand from some Indian manufacturers, despite “some challenges hampering access to bank financing for the industry”.


The United Nations (UN) approved a resolution aimed at expanding the mandate of the Kimberley Process (KP) to exclude diamonds produced in a climate of “systemic violence” in addition to civil conflicts. This means that diamonds produced in areas where workers and local residents are killed, injured or abused by government, local militia or private security forces may be sanctioned if the measure is adopted. This is a major expansion that can allow, for the first time, diamonds from countries not engaged in civil wars to be excluded by the KP.

Although the UN adopted the resolution and the World Diamond Council has approved it, it’s hardly a done deal. The KP itself has to adopt the change, and, since that requires unanimous approval from every member country, nothing is guaranteed.

The US tried to push this expansion a decade ago to no avail – it was met with fierce opposition from many African producer countries, particularly those bordering Zimbabwe, which feared reprisals from their larger neighbour. At that time, Zimbabwe’s government was under fire for major human rights abuses at the Marange mining area and assumed (not entirely wrongly) the change in the KP was directed at them.

After the UN approved the resolution, a coalition of non-governmental organisations, The Civil Society Coalition, issued a call to ban diamonds from Zimbabwe based on the fact that the country’s army is involved the mining process. The army violently assumed control of the diamond deposits in 2006 after hundreds of artisanal miners had settled in the area to dig for stones. An estimated 180 people died in the conflict, while human rights abuses allegedly continued for years afterwards.

An effort to expel Zimbabwe from the KP a decade ago was defeated on the grounds that Zimbabwe’s government was the recognised authority and that sanctions were only applied to rebel groups.

Russell Shor is a senior industry analyst at GIA in Carlsbad.