Experts with professional equipments can distinguish the two, but that distinction is so irrelevant to the Federal Trade Commission of the United States, that the previously specified "natural" origin within the FTC's definition of a diamond was removed in 2018.

In its Guides for the Jewelry, Precious Metals, and Pewter Industries, the FTC ruled "based on changes in the market, the final Guides eliminate the word 'natural' from the definition of diamond...because lab-created products that have essentially the same optical, physical and chemical properties as mined diamonds are also diamonds."

Zang Chuangyi, a scholar at Henan Polytechnic University, believes a diamond is a diamond no matter how it was formed -- grown in a lab or mined out of the ground.

"It's like comparing ice in a fridge at your home, with ice in a river," Zang said.