Buyers of diamond necklaces have been given some tips on how to test the quality of the setting for their gemstone.
Close attention should be paid to the details, packetlight.com reports, nothing how evenly and smoothly the metal holds the stone, as well as how well polished it is.
If a necklace is gold, it should have a karatage mark with a company trademark stamped next to it, giving their guarantee of the karatage.
"When buying a necklace, make sure it lays well around the neck." shoppers are advised.
"Try it on or ask a salesclerk to model it so you can check how it fits against the skin."
Finally, buyers are urged to check that the back of a piece is well finished, as well as the front.
Last week, the Daily Telegraph reported that a 101.27-carat diamond the size of a squash ball sold for £3.1 million at a Christie's auction held in Hong Kong.