SARAH & SEBASTIAN's 'Chroma' necklace is centered with a marbled opal, the signature gem of the label's native Australia. It's hand-cast from gold with a curved crescent-moon pendant and further illuminated with dainty brilliant-cut diamonds. The slender chain and delicate profile make it the ideal everyday piece. -- Australian opal; brilliant-cut G-H SI diamonds; total weight: 0.035-carats - Clasp fastening - NET-A-PORTER is a certified member of the Responsible Jewellery Council