They should be set in an open claw setting because the gem has a negative charge at one end and a positive charge at the other.
I would have put up a picture of my mum for her birthday but she threatened me with a visit to see it. She was 76 yesterday and her identical twin came for the day. The little 2 year old from next door came in to give her Margie a birthday cake, took one look at the twins and dropped the cake. Priceless.
Anyone who thinks genetics has nothing to do with fat people has never seen our family in one room. Wall to wall bazooms and bums.