I've got a pendant that I want to set some 0.9mm sapphires into. I've read that the burnish setting seems to be the simplest and looks like the setting that I want.

My surface is a textured sphere though, do I need to flatten and polish the areas I want to set the gems in?Click image for larger version. 

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Additional info: The pendant is 10k gold and about 1 1/4 inch for the globes diameter.