How much cost a 24 carat diamond?

The value of a diamond depends on its cut, colour, carat weight and its clarity.

You are most likely to find a diamond of this weight at an auction house, since it is comparatively a large diamond. You can purchase the largest stone for sale today on Blue Nile, a 23.07 carat emerald cut diamond, and pay US$1,900,000+.

(Don't confuse 24 karat with 24 carat. Twenty-four karat is a purity measure for gold: it is all gold, pure gold, unmixed with any other metal. Twenty-four carat is the weight of a diamond, which is quite large for a diamond. Regardless of weight, any diamond is all diamond, pure diamond.)