Octopus necklace in sterling silver - Rainbow moonstoneSilver Octopus necklace 'Lunar' Custom crafted piece Tactile and elegant silver Octopus necklace. The shifting, fluid form is echoed in the rings soft curves with a slightly rough texture thats pleasant to the touch, like something shaped by tide and time. Gem: This Octopus necklace features a natural rainbow moonstone with blue flash. Natural gemstones vary slightly in shade, and we will select a beautiful one for you from our curated collection.