Seeking red colored cabochon

I’m looking for a single, clear, red stone cabochon - garnet, lab
grown ruby, spinel, etc… The dimensions need to be 13 x 17 mm, and
a high dome cab is preferred. I’m a small scale jeweler, so don’t
have access to some of the larger wholesale suppliers. Those that I
have used (Rio and Stachura) don’t have stones available in quite
this dimension.

Any suggestions?
Linda in central FL