This is a sawtooth like pattern in an synthetic ruby, typical for hydrothermal manmade corundum.
Quite difficult to get this one. Especially with this 3D aspect, due to my microscope field of view limitation.
Magnification 40X +camera zoom, blue filter, darkfield and light-painting techniques (5 sources) have been used.
Edouard Monges 21/05/2008 3:57Thanks for the comment, i would like to say that no pics are modified, else than the one's i said it have been ( contrast and dead pixels) .
Best way to understand the things, is to try to understand how it works; and it can be so boundless...some or most of the time.