This works out to about 15 mm x 20 mm, or just shy of that, so it
will fit into a 16x20 setting, if you can find something this big.
If I were you I would check with the jewelers and Yellow Pages in
your area for a custom caster who might have a wax for a pendant this
size. Failing this, maybe an Orchidian has such and will cast a
mounting for you. I assume you are going to set the stone yourself,
but, if not, a custom caster might also finish the setting and set it
Best I can do here is a #7120 from the Lexwax catalog (800) 272 -
9299/FAX (913) 268 - 8415, which is a 16x20 on a ring. Maybe he
could, or you could, or your caster could cut the basket off this
ring wax and put a rabbit ears bale on it for a pendant mounting. If
you are going to do much of this kind of hard-to-find mounting stuff,
you need to learn to work in wax a little or find someone who can.
That’s my take on it . . . what do the real experts say??