How much is a 15 count 18mlx13ml blue swiss topaz worth? How much is a 4 carat diamond worth? How much is?

Also, how much is a 2 carat amthyest stone worth? How much is a 2 carat blue diamond worth?How much is a 15 count 18mlx13ml blue swiss topaz worth? How much is a 4 carat diamond worth? How much is?The worth of all gemstones vary greatly on a number of factors, including clarity and purity. The worth therefore can't be determined by the information given. Take the gems to a reputable gemsmith.