Nick Hodgson gives a tutorial on Gem stone identification using the polariscope. This is a two part tutorial.
Ancient Peruvian Mate
Lost wax casting, step : cleaning the freshly cast silver charms. Feathered Gems Jewelry has documented the entire process of casting Braille charms for Seedlings Braille Boo...
Smelting iron from ore by a smith family in West Africa. The only complete, high quality video of iron smelting in Africa. Making charcoal, digging ore and flux, building the ...