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  2. List of U.S. state minerals, rocks, stones and gemstones

    en.wikipedia.org/wiki/List_of_U.S._state...

    ^ Florida's state gem, moonstone, was adopted to highlight Florida's role in the United States' Lunar program, which landed the first astronauts on the Moon. [81] ^ Since 1983, Massachusetts has had 3 other official state rocks: State Historical Rock (Plymouth Rock), State Explorer Rock (Dighton Rock), and State Building and Monument Stone . In ...

  3. Emerald - Wikipedia

    en.wikipedia.org/wiki/Emerald

    Emeralds tend to have numerous inclusions and surface-breaking fissures. Unlike diamonds, where the loupe standard (i.e., 10× magnification) is used to grade clarity, emeralds are graded by eye. Thus, if an emerald has no visible inclusions to the eye (assuming normal visual acuity) it is considered flawless. Stones that lack surface breaking ...

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including ( clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...

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  7. 'Antiques Roadshow': diamond and ruby jewelry worth a fortune

    www.aol.com/news/2014-08-12-antiques-roadshow...

    Well, today, that 3-piece set is valued between $400,000-$450,000. According to The Daily Mail, rubies are the most expensive gems per carat on earth! To get your hands on some rubies and/or ...

  8. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    However, the argument for the Sanskrit origin is strong. The term first appears in Roman references around 250 BC, at a time when the opal was valued above all other gems. The opals were supplied by traders from the Bosporus, who claimed the gems were being supplied from India. Before this, the stone was referred to by a variety of names, but ...

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