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Some chameleon 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 grading diamonds for clients, Stephanie Persaud at …
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