For a dazzling loose marquise cut diamond, browse our inventory. Our marquise diamond gems are natural, and they come with a lifetime guarantee. If you need a marquise diamond that is smaller than 1.00CT or larger than 5.00CT, we give you plenty of size options. If you buy the wrong size, you have 30 days to return your marquise diamond for a full refund. To emphasize how much you save when you buy from PrimeStyle, we show our wholesale prices and their comparative retail prices. As a way of thanking you for choosing us, we ship your marquise cut diamond free of charge.