Where can I find these briolette jewel rivets?

Hi,

I am in the process of making an item with my own drilled briolette gems, which I need findings/rivets to secure them to leather. I have all the materials I need, aside from these rivet holders which I cannot find anywhere, even jewellery supply magazines!

These are the rivets I am after:
http://ny-image3.etsy.com/il_570xN.193198167.jpg

If anyone can point me in the right direction, that would be appreciated. I am looking for solid gold or sterling silver. Thank you!