10k white gold diamond and emerald cut pink tourmaline birthstone ring. The perfect October birthstone ring or mothers ring, this 10 karat white gold band has emerald cut pink tourmalines and diamonds alternating half way around the ring. All birthstone rings and mother's rings are available in all birthstones, although the April (diamond) version may cost more. Looks great worn alone, or as a stackable ring. Comes in a stock size 7.