What is a 1 carat VS1 color E diamond worth?

Depending on the store, it will cost different prices. I will use the company Stauer. They'd make it cost about $200, considering it's just 1 carat.

Another Answer

If you're selling such a diamond, best practices dictate that you pay for a certified gemologist's certificate that documents the characteristics you describe. This will give you a more firm basis upon which to establish a market price for the diamond.

Today, on Blue Nile, you'll pay between US$4,300+ and US$4,700+, depending on the cut that you want.