Thank you for viewing. The following is quoted from the product introduction of JAM HOME MADE: This necklace top, shaped like the letter "A" for blood type "A," is from the NEW TYPE / Blood Type accessory series. It's a necklace that allows each person wearing it to give it a personal meaning. A black diamond is subtly set on the inside. It has a simple design that makes the most of the silver, giving it a solid look. It's recommended as a birthday present, a gift, or even as a pair necklace, where you and your partner wear each other's blood types. Material: Silver 925 Color/Finish: Smoke Mirror Finish (Smoked Mirror Finish) Stone: Black Diamond