The 5th C
We often talk about flourescence in the diamond branch, but what is it really? It is the light of some diamonds when exposed to ultraviolet rays, invisible to the naked eye. In some certifications as G.I.A.’s one (Gemological Institute of America), flourescence refers to strength or the diamonds reaction towards ultraviolet wave-length, which is basic element for daylight.
The light of the diamond remains til it is exposed to the ultraviolet light. It is interesting to notice that in the last decade diamonds verified and certified by G.I.A. (25-35%) showed different grades of flourescence. Consider that only 10% of these diamonds has such a strong light to influence their appearance and 95% of these last ones has a strong blue flourescence. Yellow, orange, white or other colour reactions are very rare.
Studies on Fluorescence
Fluorescence is the sparlke, usually bluish, which is released from some diamonds when exposed to the ultraviolet light. The best diamonds don’t have fluorescence. Generally, a weak fluorescence doesn’t influence the look of the diamond. Some clients prefer stones of weak or moderate blue fluorescence because a yellowish diamond (less priced) can appear whiter in daylight.
According to the intensity of the emanated light, four gradings of fluorescence are set:
- VERY SLIGHT;
- VERY STRONG.
The word carat comes from the carob seeds used to weigh stones in the past. The diamond weight determines its size and its diameter.
The colour is a very important characteristic for a diamond and it is also the main element that influences our appreciation of a gem, especially when mounted on a jewel.
Clarity is the main element to dermine the value of a diamond for investement or of a precious stone. Find out more.
The cut can be described as the man’s contibution to the beauty of a diamond, it is the way a stone or a diamond is cut.