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鈥檛 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掳C or kept in the dark for more than 24 hours.
But while analysing diamonds for clients, Stephanie Persaud at the Gemological Institute of America (GIA) in Carlsbad,…
Article amended on 6 October 2021
We have clarified the name of the diamonds
