Learn more about the Astra Lab Sapphire and Diamond Halo Octagon Cut Necklace. The delicate chain - made of the finest 18k gold vermeil - is interspersed with subtle, encapsulated lab grown diamonds, adding extra intrigue to a classic piece. The beautiful 2.00ct lab grown sapphire sits within a halo of 0.16ct of H/SI consciously crafted diamonds, which creates a beautiful sparkle effect with every movement of the wearer. This Art Deco inspired piece makes a special gift for any occasion, or even a self-gift to treasure. Benefit from free worldwide delivery, sleek packaging a 5-year guarantee.