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English: The Red Diamond Play Button, awarded by YouTube to channels of at least 100,000,000 subscribers. Русский: Красная бриллиантовая кнопка, которой награждают каналы, набравшие как минимум 100 000 000 (сто миллионов) подписчиков.
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Diamond also has a very high refractive index and a relatively high optical dispersion. Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle , although a few have come from as deep as 800 kilometres (500 mi).
Because it is cubic in structure, diamond is also isotropic. Its high dispersion of 0.044 (variation of refractive index across the visible spectrum) manifests in the perceptible fire of cut diamonds. This fire—flashes of prismatic colors seen in transparent stones—is perhaps diamond's most important optical property from a jewelry perspective.
The largest flawless diamond in the world is known as The Paragon, a D-color gem weighing 137.82 carats (27.564 g), [1] and the tenth largest white diamond in the world. [citation needed] The gem was mined in Brazil and attracted attention for being an exceptional white, flawless stone of great size. [2]
United Nations Security Council resolution 1306, adopted on 5 July 2000, after recalling all previous resolutions on the situation in Sierra Leone, particularly resolutions 1132 (1997), 1171 (1998) and 1299 (2000), the Council decided to prohibit the direct or indirect import of rough diamonds from the country. [1]