Chameleon diamond

Some diamonds change from grey (left) to yellow (right) when submerged in liquid nitrogen

Jae Liao

Collectors lusting after the rarest of gems have a new kind to add to their list: diamonds that change colour when made extremely cold.

These aren’t the first gems known to change colour: so-called “chameleon diamonds”, first discovered in 1866, switch their hue from greenish to either brown or yellow when heated to about 200°C or kept in the dark for more than 24 hours.

But while analysing diamonds for clients, Stephanie Persaud at the …

Article amended on
6 October 2021

We have clarified the name of the diamonds



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