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  2. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    During the 1960s through to the mid-1970s, the Querétaro mines were heavily mined. Today's opal miners report that it was much easier to find quality opals with a lot of fire and play of color back then, whereas today the gem-quality opals are very hard to come by and command hundreds of US dollars or more.

  3. Gemological Institute of America - Wikipedia

    en.wikipedia.org/wiki/Gemological_Institute_of...

    The Gemological Institute of America ( GIA) is a nonprofit institute based in Carlsbad, California. It is dedicated to research and education in the field of gemology and the jewelry arts. [ 1] Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality.

  4. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Diamond[ a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...

  5. The diamond industry is ‘in trouble’ after prices sunk 6% ...

    www.aol.com/finance/diamond-industry-trouble...

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  6. G. E. M. Membership Department Stores - Wikipedia

    en.wikipedia.org/wiki/G._E._M._Membership...

    G. E. M. Membership Department Stores was a chain of discount stores, in the US and Canada. Their first location opened in Denver in 1956. GEM offered something different: membership. The qualifications included government-, religious- and school employees, members of the armed forces, and employees of companies that did “substantial work ...

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

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

    The collection consisted of a ring, a pendant necklace and a bracelet that was worth a lot more than she expected. The appraiser said, "The ring with the fine ruby and the very very white diamonds ...

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