This sterling silver twist open ring is available both 16g (1.2mm) and 14g (1.6mm) thickness.
It's casted in recycled sterling silver from one of my handmade originals and I oxidize it before polishing to bring out the detail of the design.
It's mainly designed for use in a septum piercing but it will work for a nipple or earlobe piercing, see measurments in the pictures.