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Diana and Charles became engaged in February 1981. Her engagement ring consisted of 14 diamonds surrounding a 12-carat oval blue Ceylon sapphire set in 18-karat white gold. [54] [55] It was created by then-crown jeweller Garrard. The design was inspired by Queen Victoria's sapphire-and-diamond cluster brooch, a wedding present from Prince ...
Fancy sapphires of various colours are also available. In the United States, blue sapphire tends to be the most popular and most affordable of the three major precious gemstones (emerald, ruby, and sapphire). Turquoise Turquoise is found in only a few places on Earth, and the world's largest turquoise-producing region is the southwest United ...
The coronation regalia are the only working set in Europe and the collection is the most historically complete of any royal regalia in the world. [6] Objects used at the coronation ceremony variously denote the monarch's roles as head of state of the United Kingdom , Supreme Governor of the Church of England , and head of the British armed forces.
Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine. Aquamarine is often heated to remove yellow tones, or to change green colors into the more desirable blue, or enhance its existing blue color to a deeper blue. [42]
Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]
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.
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