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It varies, but some people use chisel tools to rotary tools to even higher end laser cutting tools. Then usually a paint in the cut. Every time I go to the gem fair in Utah I check out the booths that let you purchase these tools. It's really cool

That is awesome! Thank you for explaining @o-soul :)Much love!

are they expensive ?

The finished stones vary. I am not sure about the price of tools :) Will be looking into it soon for sure :)

Much love and gratitude @bryanlai98

Namaste