VOA新闻杂志2024--Are Lab-grown Diamonds Sustainable?

Are Lab-grown Diamonds Sustainable?

Human-made diamonds come with an appealing claim: Manufacturers say the stones are produced ethically² using renewable energy. But many of the products do not meet that claim or their producers do not confirm the electricity sources they use. And, laboratory diamonds require a lot of electricity to produce.

In the United States, lab-grown diamond sales increased 16 percent in 2023 from 2022, says Edahn Golan, an industry expert. The stones cost much less than natural diamonds.

Bario Neal is a jewelry³ store in Philadelphia, Pennsylvania. It uses lab diamonds. All of the stones are either made with renewable energy or neutral use of energy through the carbon credit system. Credits pay for activities like planting trees, which capture carbon.

Social media posts show Millennials and Generation Zs proudly explaining the purchase of their lab-grown diamonds for sustainability and ethical¹ reasons. But the sustainability of production is questionable⁴. A high number of manufacturers are not transparent⁵, or open, about their operations.

Many of the manufacturers are in India, where about 75 percent of electricity comes from burning coal. The companies use words like "sustainable" and "environmentally-friendly" on their websites. But they do not release reports on the environmental effects of their operations.

Cupid Diamonds, for example, says on its website that it produces diamonds in "an environmentally friendly manner." But it did not answer questions about the sustainability of its operations.

Solar energy is quickly expanding in India and there are some companies, such as Greenlab Diamonds, that use renewables in their manufacturing processes.

China is the other major country producing laboratory diamonds. The largest makers⁶ did not return requests for comment. They also did not release details about their electricity source.

More than half of China's electricity came from coal in 2023.

Paul Zimnisky is a diamond industry expert. He said few companies are honest about their supply chains and their use of renewable energy.

Zimnisky said a lot of companies claim to make an "environmentally-friendly product when they aren't really doing anything that's environmentally friendly."

How it is made

Lab diamonds have been in production around seventy years. Producers treat carbon to high pressure and high temperature. The idea is to copy the natural conditions that form diamonds underground. But, nature spends at least one billion years to make a diamond. Lab diamonds are complete in a few weeks.

In the past, the stones were used mostly in industries like stone cutting, mining and dentistry tools.

Over time the laboratories, or foundries, have gotten better at making stones. Production costs have dropped as technology improves.

Companies now can manufacture as many stones as they want and choose their size and quality.

Diamonds, whether lab-grown or natural, are chemically identical and entirely⁷ made out of carbon. Experts can identify between the two using lasers to examine their atomic structures.

Marketing⁸ battle

The lab diamond is competing in the same market as natural stones. Worldwide, lab-grown diamonds are now 5 to 6 percent of that market. And, the public battle for customers has begun.

The natural diamond industry and some experts argue that lab-grown diamonds will not hold value over time.

Zimnisky predicts that natural diamonds will continue to sell in the thousands and tens of thousands of dollars for engagement rings.

And the human-made stone?

"Five to ten years into the future, I think there's going to be very few customers that are willing to spend thousands of dollars for a lab diamond," he said.

Page Neal said she co-founded Bario Neal in 2008 to "create jewelry of lasting⁹ value that would have a positive impact on people and the planet."

She added: "We want to only work with materials that we feel like our clients would be proud to own."

Words in This Story

sustainable — adj. involving methods that do not completely use up or destroy natural resources

dentist — n. a person whose job is to care for people's teeth

engagement — n. an agreement to be married

1 ethical   

adj.伦理的，道德的，合乎道德的

参考例句：

• It is necessary to get the youth to have a high ethical concept.必须使青年具有高度的道德观念。
• It was a debate which aroused fervent ethical arguments.那是一场引发强烈的伦理道德争论的辩论。

2 ethically   

adv.在伦理上，道德上

参考例句：

• Ethically , we have nothing to be ashamed about . 从伦理上说，我们没有什么好羞愧的。
• Describe the appropriate action to take in an ethically ambiguous situation. 描述适当行为采取在一个道德地模棱两可的情况。

3 jewelry   

n.（jewllery）（总称）珠宝

参考例句：

• The burglars walked off with all my jewelry.夜盗偷走了我的全部珠宝。
• Jewelry and lace are mostly feminine belongings.珠宝和花边多数是女性用品。

4 questionable   

adj.可疑的，有问题的

参考例句：

• There are still a few questionable points in the case.这个案件还有几个疑点。
• Your argument is based on a set of questionable assumptions.你的论证建立在一套有问题的假设上。

5 transparent   

adj.明显的，无疑的；透明的

参考例句：

• The water is so transparent that we can see the fishes swimming.水清澈透明，可以看到鱼儿游来游去。
• The window glass is transparent.窗玻璃是透明的。

6 makers   

n.制造者，制造商（maker的复数形式）

参考例句：

• The makers of the product assured us that there had been no sacrifice of quality. 这一产品的制造商向我们保证说他们没有牺牲质量。
• The makers are about to launch out a new product. 制造商们马上要生产一种新产品。 来自《简明英汉词典》

7 entirely   

ad.全部地，完整地；完全地，彻底地

参考例句：

• The fire was entirely caused by their neglect of duty. 那场火灾完全是由于他们失职而引起的。
• His life was entirely given up to the educational work. 他的一生统统献给了教育工作。

8 marketing   

n.行销，在市场的买卖，买东西

参考例句：

• They are developing marketing network.他们正在发展销售网络。
• He often goes marketing.他经常去市场做生意。

9 lasting   

adj.永久的，永恒的；vbl.持续，维持

参考例句：

• The lasting war debased the value of the dollar.持久的战争使美元贬值。
• We hope for a lasting settlement of all these troubles.我们希望这些纠纷能获得永久的解决。