1. Cullinan Diamond – est $400 million
The Cullinan Diamond was an enormous stone that broke all previous records for gem-quality diamonds. It was the largest ever found, originally weighing in at 3106.75 carats (around 620 grams). Found in 1905 near Pretoria, South Africa it was eventually split into nine large pieces, some of which are in turn record holders. The largest of these is the Cullinan I, also known as the Great Star of Africa, which became the largest polished white diamond in the world and is now a part of the Crown Jewels of the United Kingdom.

Very tasty, thankyou!