Channel Set Synthetic Sapphire Flex Style Bracelet. Forty (40) French cut, lightly included, medium dark blue Sapphire, Corundum. Approx. 4.50 x 3.50 x 1.90mm. Synthetic sapphires are channel set in a linear style flex bracelet that measures 7.00mm Channel Set Synthetic Sapphire Flex Style Bracelet. Forty (40) French cut, lightly included, medium dark blue Sapphire, Corundum. Approx. 4.50 x 3.50 x 1.90mm. Synthetic sapphires are channel set in a linear style flex bracelet that measures 7.00mm