The Astley Clarke Midnight Cosmos locket in yellow gold is billed as the independent girl's take on the eternity ring. This nostalgic necklace from the Astley Clarke Muse collection features a large yellow gold locket with a ring of pavé diamonds framed on either side by a circle of midnight blue enamel. Strung on a long 33in chain, this memory locket is designed to be worn everyday as a pendant. The locket opens to reveal a secret chamber where traditionally a treasured photo or lock of hair would be kept. But what will you hide inside it?