Sourcing Stones for a Previously Set Halo

I am a totally newbie and I really have no idea about settings etc, so I'm hoping someone here could help me. I reset my Old Mine Cut cushion cut diamond, and now I have an empty halo setting that I would like to use as my travel ring. I'm looking to set it with a lab grown colored gem or a colored simulant like a yellow diamond simulant (basically, something colored and inexpensive). The problem is, is that I have no idea how to source something that would fit the setting. The diamond I reset is a 3ct old mine cut slightly-elongated cushion that measures 8.23 x 7.64 x 6.66mm. Thanks for reading and for you help.
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That's a bit tough, I don't know any places that custom cut CZ (others may know), but if you are okay with green I know Better Than Diamond will custom cut a lab emerald to your specifications:
Avarra™ Custom Cut, Lab Grown Colombian Emerald

Hope other chime in with more knowledge than me!
Thank you! I will certainly check that out. Emerald is my daughter's birthstone and I lost my emerald ring on an airplane, so this just might be perfect!