Celebrating the sparkling formation of the stars, this Rainbow Cosma Necklace features a 18ct gold vermeil on sterling silver disc studded with eight brilliant-cut gemstones in a rainbow design from sky blue topaz, blue topaz, iolite, peridot, citrine, pink tourmaline, rhodolite and amethyst. Designed to gently move on its axis to best catch the light, this necklace is a contemporary rainbow take on the star chart and is beautifully unique.