Every diamond in the KAS collection is lab grown by CVD, which is why this holds the whole catalogue. A lab grown diamond is a real diamond: the same material, the same hardness and the same optics as a mined one, grown rather than dug out of the ground.
Coloured gemstones are the exception and may be natural, and each product page says which. If you would like a natural diamond, we take that as a custom order — tell us the stone you have in mind and we will quote it.
