Jagersfontein Mine /ˌjeɪɡərzˈfɒnteɪn/ is an abandoned open-pit mine in South Africa, located close to the town of Jagersfontein and about 110 kilometres (68 miles) south-west of Bloemfontein. Since it was first established in 1870, two of the ten biggest diamonds ever discovered, the Excelsior and the Reitz (now called the Jubilee), were mined from Jagersfontein. The term "Jagers" has since been coined to denote the distinctive faint bluish tint of the gems from this mine. Among geologists, Jagersfontein is known as a kimberlite pipe, and a prime locality for mantle xenoliths, some of which are believed to have come from depths of 300–500 km (190–310 mi).