Hello, I've been learning jewelry making as a hobby and want to make a 9ct yellow gold ring with a faceted stone in a basket setting.

Will 4 prongs be able to safely hold a 7mm. Some people say that you should use 6 prongs when going above 6.5mm.

Also will it be easier to set a 6mm or 7mm stone. And is 9ct yellow gold more durable than 9ct white gold.

Thank you for your time