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Blue John (also known as Derbyshire Spar) is a semi-precious mineral, a rare form of fluorite with bands of a purple-blue or yellowish colour. In the United Kingdom it is found only at Blue John Cavern and Treak Cliff Cavern at Castleton in Derbyshire. During the 19th century, it was mined for its ornamental value, and mining continues on a ...
The regalia contain around 23,578 gemstones, among them Cullinan I (530 carats (106 g)), the largest clear cut diamond in the world, set in the Sovereign's Sceptre with Cross. It was cut from the largest gem-quality rough diamond ever found, the eponymous Cullinan, discovered in South Africa in 1905 and presented to Edward VII.
Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
It is 22-carat gold, 30 centimetres (12 in) tall, weighs 2.23 kilograms (4.9 lb), and is decorated with 444 precious and fine gemstones. The crown is similar in weight and overall appearance to the original, but its arches are Baroque. After 1689, owing to its weight the crown was not used to crown any monarch for over 200 years.
The gemstone at the front of the Imperial State Crown. The Black Prince's Ruby is a large, irregular cabochon red spinel weighing 170 carats (34 g) set in the cross pattée above the Cullinan II diamond at the front of the Imperial State Crown of the United Kingdom. [1]
Victoria had a small crown made in 1870, which resembled the Tudor Crown, [15] declining to wear the 1838 crown which she found heavy and uncomfortable. [16] In 1909, the larger crown was altered to accommodate the 317-carat (63 g) Cullinan II diamond, also known as the Second Star of Africa.
In modern use, the precious stones are emerald, ruby, sapphire and diamond, with all other gemstones being semi-precious. [9] This distinction reflects the rarity of the respective stones in ancient times, as well as their quality: all are translucent , with fine color in their purest forms (except for the colorless diamond), and very hard with ...
A large number of hoards associated with the British Bronze Age, approximately 2700 BC to 8th century BC, have been found in Great Britain.Most of these hoards comprise bronze tools and weapons such as axeheads, chisels, spearheads and knives, and in many cases may be founder's hoards buried with the intention of recovery at a later date for use in casting new bronze items.
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