Siweiware uses UHPC [Ultra High Performance Concrete] combined with strong aggregates [diamond dust and silicon carbide] on all jewelry. The material is 20x stronger than traditional concrete, but in the unlikely event of broken jewelry, please contact our customer service. We will assess the damage, and let you know. If it can be repaired, you can ship the broken jewelry back to us, and give us some time[concrete needs weeks to reach most strength]. We will repair it, ship it back to you, for free. We love our customers.