The reason why they change colour is still a mystery, but some have been found to do so either when heated to around 320☏ (200☌), or if kept in the dark for more than 24 hours.īecause their appearance can be altered when exposed to light, heat and now the cold, experts think there may be more than one mechanism at work to explain how the diamonds change colour. However, the term for such colour-changing stones was not used in the jewellery trade until 1943. The chameleon diamond phenomenon was first discovered in 1866 by Georges Halphen, a Paris diamond merchant. Such cooling is fairly routine in labs, and is carried out to make the atoms in a diamond vibrate less, allowing for more accurate measurements to be taken about how the gem absorbs different wavelengths of light.
0 Comments
Leave a Reply. |