Gemstone stitch markers available on Etsy! Lots of jade and agate, as well as others like jasper, quartz, sodalite, and golden sheen obsidian. Some are dyed/color enhanced and are marked as such to the best of my knowledge.
Stitch marker rings, leverback clips, jump rings, ball head pins, and bead caps are all golden-plated brass.
More will be posted in the future!