Inspired by a stellar constellation, this rainbow diamond necklace boasts an impressive combination of the world's rarest coloured diamonds. An oval-cut fancy intense-yellow diamond is claw-set along with an oval-cut fancy green, a round-cut white and a 0.02 carat round-cut 6PR Argyle pink diamond. The design of this 18 karat gold necklace fuses natural deep-earth treasures into an out-of-this-world formation.