Another set of '-men', this time to replace amethyst men. Instead of each gem as an individual creature, each gem type is included as a separate caste on the same creature. There are a huge number of gem types in DF, so these guys have a whopping 100 castes. I didn't include any of the opals as castes because (as far as i know) opals are defined by their structure/shape and thus it seemed weird to make a man out of them. The population ratios for these guys are set based on their material value and, in a few cases, their rarity.

*EDIT* Updated for DF 2014