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The Big Hole. From 1871 to 1914, 50,000 miners dug the Big Hole with picks and shovels, yielding 2,722 kg (6,001 lb) of diamonds, [19] and by 1873 Kimberley was the second largest town in South Africa, having an approximate population of 40,000. [20]
Cullinan produced stones of various cuts and sizes, the largest of which is named Cullinan I, and named the Great Star of Africa by Edward VII, and at 530.4 carats (106.08 g) it is the largest clear cut diamond in the world.
Early observers saw the processing of mast using stones, and one later recreation achieved similar results: nuts were placed, one at a time, on stone (an "anvil" stone) and then struck with a smaller "hammer" stone: "As nuts were cracked in this manner a pit developed in the lower stone; the pit deepened as additional nuts were cracked, and ...
Research by historian Steve Lunderstedt in 2005 confirmed that the mine was the biggest hand-excavated hole in the world at 19.65 hectares (48.6 acres), slightly larger than the Big Hole of 17 ha (42 acres) in Kimberley, which had claimed the title up to then. It is probably not the deepest, though, since the final depth of the Big Hole reached ...
The upper layers of the mine (down to 340 m (1,120 ft)) had very high diamond contents of four carats (0.80 g) per tonne of ore, with a relatively high ratio of gems to industrial stones. The yield decreased to about 2 carats (0.40 g) per tonne and the production rate slowed to 2,000,000 carats (400 kg; 880 lb) per year near the pit bottom.
[3] [13] [22] According to oral traditions, the central hole was made with a coral reef stone used as a "fire drill", presumably a large bow drill. [13] While the clam shells and coral are made of calcium carbonate too, they consist of the aragonite form, which is harder than the stone's calcite (3.5–4.0 and 3.0 in the Mohs hardness scale ...
The Hope Diamond is a large, 45.52-carat (9.104 g; 0.3211 oz), [a] [7] [8] [9] deep-blue diamond, studded in a pendant Toison d ’or. [1] It is a dark greyish-blue color under ordinary light due to trace amounts of boron within its crystal structure, and it exhibits a red phosphorescence under exposure to ultraviolet light.
This is a list of gemstones, organized by species and types. Minerals There ... Large. This page always uses small font size. Width. Standard. Wide.
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