What is the value of an 8 carat diamond approximately?

You can buy a diamond from BlueNile today ranging in weight from 7.69 carats to 8.44 carats, all round brilliant cuts between G and H colour, and spend from US152,000+ to US$332,000+.

If you have a stone of this size to sell, best practices dictate that you have the stone certified by a certified gemologist, so that when you attempt to sell it, you have a valid idea of what it might be worth in your sale.