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.