

Not sure from jeweler perspective, they might be hard to put into jewelry.
But synthetic sapphire is relatively easy to produce, enough that it’s used for watch faces.
https://en.wikipedia.org/wiki/Sapphire#/media/File:Sapphire_boule,_Kyropoulos_method.jpg

I’m not sure he actually fleeced the big buyers. One of the main “problems” in paying a bribe is how to present the payment as something legitimate.
If you can maybe just innocently “invest” in some crypto scheme. Totally legitimate investment, just so happened it failed, oh well.