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