Which you probably don't, Gemstone Mystics is dead. At least this guild and the original shop is. However, that doesn't mean they're gone. Gemstone Mystics have now been brought to Doku Adoptables (a group on deviantART that I have created) as a species that was just released this month.

Gemstone Mystics can now only have two forms: baby (which is a gemstone) and adult. Babies can be obtained for free or through breeding and adults can also be obtained for free or bought.

Among Gemstone Mystics there are actually more adoptable species available and they are:

Winged Cats
Sugar Pups
Mecha Armor Animals
Zebyik

To check out this group, the new Gemstone Mystics, and other species of adoptables, go here: Doku Adoptables.