Unearth the Astra Lab Ruby and Diamond Halo Octagon Cut Necklace. The 1.80ct lab grown ruby sits amongst a halo of 0.16ct of consciously crafted H/SI diamonds. The traditional piece is given a modern twist with the addition of subtle diamonds expertly placed throughout the chain, in addition to the halo of cool-toned diamonds that offset the deep, rich ruby. This timeless ruby piece is perfect as a gift – or self gift – for any recipient, but especially meaningful for a July birthday. Benefit from free worldwide delivery, sleek packaging and a 5-year guarantee with The Diamond Store.