Cullinan Diamond Mine Tour

Cullinan is a small mining village east of Pretoria, about an hour and a half by road from Johannesburg, and its mine has one of the most famous names in gemstones. In 1905 a stone of more than three thousand carats was found here, the largest gem-quality rough diamond ever recovered, and it was named after the mine's founder, Sir Thomas Cullinan. The stone was cut into several major gems, and the two largest now form part of the British crown jewels. The mine has continued to produce notable stones since, including rare blue diamonds, which gives the tour a sense of living industry rather than a museum piece. A guided visit usually starts at the surface, with an introduction to how a kimberlite pipe forms, how the open pit was dug and how the mine later went deep underground. Guides explain how diamonds are recovered, sorted and valued, and the setting, with the vast pit and the old headgear on the skyline, is impressive in its own right. Tour formats and days vary, so confirm what is running before you travel.

Some formats have included underground components, but these depend on safety and operating conditions, so do not assume one is available. Expect to wear closed shoes and to follow safety instructions strictly, as this is a working site. Photography rules can be firm in sensitive areas.

The village itself deserves an hour. Cullinan grew up around the mine in the early twentieth century, and its tree-lined streets, old company houses and Edwardian-style buildings give it a character that is unusual in Gauteng. There are small cafes, craft shops and a tearoom or two, and it is easy to combine the tour with lunch. If you travel on a day tour from Johannesburg or Pretoria, the mine is often paired with a Pretoria city tour, which makes a full and varied day.

It is less suited to very young children, who may find the explanations long. Bring a hat and water for the surface, a layer in winter, and a little cash for the village shops. Do not expect to buy rough diamonds from the mine itself; if you want a souvenir, the village has gift shops with more modest items.

It helps to know a little before you go. Diamonds are carried to the surface from deep in the earth by volcanic pipes called kimberlites, and the Cullinan pipe is one of the best-known in the world. That single fact makes the guided commentary much more vivid, as you look across the pit and picture the rock being blasted, hauled and crushed.

If the group allows, ask your guide how stones are graded for colour, clarity and size, and why a rare blue diamond is worth so much more than a white stone of similar weight. Keep an eye on the weather too, since surface tours are more comfortable on a dry, mild morning.