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What type of material should I use for the prong fittings?
I'd rather not use a very expensive metal like gold or platinum. However, I definitely want to avoid contact dermatitis which is usually caused by nickel based alloys with about 17% of females being allergic to it.
Other fitting options?
I went with prongs but are there any more suitable fitting options for those gemstones? They are 10x12 mm.