- Black geode formation with a quartz crystal interior; blue sapphires, total weight: 1.32-carats; round brilliant-cut G-H VS1-SI diamonds, total weight: 1.21-carats - Butterfly fastening for pierced ears - This piece is handmade and as such may have some small flecks or scratches - This piece has been certified in accordance with the Hallmarking Act 1973 - NET-A-PORTER is a certified member of the Responsible Jewellery Council