[Source] Contra Luz Opal

Hello, I have a request to design a ladies ring using a Contra Luz
Opal about 9mmx7mm in size. Since I am not that familiar with this
gem, I really do not have a supplier in mind that may offer them.
Does anyone have any and experience working with Contra
Luz Opals? Also, any tips on where I may be able to purchase them
would be greatly appreciated. Thank you all in advance,
Mark Cunha