What is the value of the Star of Africa diamond?

Answer 1

The Star of Africa, also known as The Cullinan Diamond, was gifted to the King of England when it was found.

None of the cut and polished stones from The Cullinan have ever changed hands for money, so no value or price can be determined. You can read more about these diamonds, below.

The Cullinan is a Type IIa diamond, which according to Wikipedia indicates that:

"Type IIa diamonds make up 1-2% of all natural diamonds (1.8% of gem diamonds). These diamonds are almost or entirely devoid of impurities, and consequently are usually colourless and have the highest thermal conductivity. They are very transparent in ultraviolet, down to 230 nm."

Diamonds of this type have traded hands, for example, in November 2011's Christie's Hong Kong sale. There, a 35.77 carat type IIa diamond sold for US$8,313,760 or US$232,422 per carat. You can use this math to estimate the value of any of the nine gems cut from the Cullinan.

Answer 2

In the Tower of London with other crown jewels.