Technibond Heart Charm CZ Simulated Diamond Ring Size 7 Technibond jewelry is crafted from 925 sterling silver bonded with 40 mil. layers thick of 14 kt. gold. Charms on rings are so pretty as is this treasure. Home Shopping Network offered this for sale quite a few years back. I bought this and never wore it. A lifetime warrenty came with all technibond items at that time. I do not have the box or the warrenty paper with it. Marked 925 inside of band with yellow gold finish. Insurance is required with this purchase and is reflected into the shipping and handling cost.