You can find here answers & tutorials to all the questions miniature painters and sculptors could have. How to blend colors, how to do a NMM, an OSL, how to sculpt a face, build a diorama... for your 28-54mm miniatures. Tutofig compiles more than 2000 "how to" or step by step, made by impassioned people, in various languages. Being Games workshop addict, who wants to paint armies, or contest painters searching for the last missing tips, you can find here everything you could wish... Learn, rhapsodize on other's work and share your own tutorials !
Really sorry i couldnt really film that one but i think it will explain the basic way that i do my gems or glass pieces. This is aplicable anywhere you will have a glass or gem looking object so for the Eldar players, the Space marine gems or even for the Warhammer fantasy player paint for exemple high elf you can use this to make stunning gems.