Diamond http://www.mindat.org/min-1282.html Diamond is a form of carbon. The vast majority of fluorescent minerals contain one or more transition elements or lanthanide elements as a fluorescence activator. Diamond, however, is the only mineral in which non-metals act as an activator. In the diamond crystal lattice carbon may be sparsely replaced by boron. This causes a white to blue-white fluorescence. Carbon atoms can also be replaced by a single nitrogen atom. This, in turn, causes a yellow to orange daylight color and ditto fluorescence. These diamonds are often called "canary" diamonds. Nitrogen atoms sometimes replace carbon in groups of three (triplets) or five (quintuplets) atoms. Diamonds can fluoresce in almost all the colors of the rainbow.
