I would use a new head and with four prongs as well. I think six pronged settings are more suitable for stones that are more expensive, like diamonds. They really cover too much of the stone otherwise, especially if it's 6mm in size.Michael_E|1307753281|2942967 said:Maybe, but I'd recommend just pulling the head and putting your tourmaline in a new head. using old white gold heads gives you about a 50% chance of having some of the old prong tips breaking off during the removal or the reset. Using a new head would also be much less risky for the tourmaline, as the new head will be softer and bend easier, requiring less force for a tight setting job.