Diamonds [2.5 carats]

When diamonds form deep in the earth, they do so under tremendous amounts of pressure and at very high temperatures. If solidification (crystallisation) of the diamond accurse in an area where Boron is present, this will cause the diamond to fluoresce.

Jewellers are well aware of the fluorescent properties of diamonds and use ultraviolet lights to screen stones. The property of fluorescents is something that can either enhance or diminish the value of the diamond, depending upon the visually qualities desired from the stone and the fashions of the day. In the past, the 'blue-white' was the most desired and dazzling diamond. In recent years however, its brighter-than-bright quality was attributed to the fluorescence of the stone and the fortunes of the 'blue-white' fell. The prescience of fluorescence is not all bad news though as many jewellers realise it gives that little extra sparkle to a stone that may contain a number of impurities that effect it's ability to shine.