How much does a diamond cost?

That depends on the cut, carat, color and clarity. For e.g, a round 1 carat D color, IF clarity, and an Excellent cut diamond costs about $11, 081 and a 1 carat marquise diamond with the same characteristics costs about $17, 066, both of which are GIA certified. Another example is of a round G color, VS1 clarity, very good cut diamond is for $5521 and a princess diamond with the same characteristics is for $4391. So it all depends on what you are looking for and what your budget is.