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  2. Lake Superior agate - Wikipedia

    en.wikipedia.org/wiki/Lake_Superior_agate

    Saw-cut and polish—Stones up to 1/2 kg are cut with diamond saws into thin slabs, which then are cut into various shapes. One side of the shaped slab is polished producing fine jewelry pieces and collectible gems called cabochons. (Note the value of large Lake Superior agates, which weigh a few pounds or more, will lose most of their value if ...

  3. Gold-filled jewelry - Wikipedia

    en.wikipedia.org/wiki/Gold-filled_jewelry

    This abbreviation is incompatible with FTC guidelines, which require clear labeling of the gold content and fineness (e.g., 1/20 14K GF). [3] Most high quality gold-filled pieces have the same appearance as high carat gold, and gold-filled items, even with daily wear, can last 10 to 30 years though the layer of gold will eventually wear off ...

  4. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    A Peruvian opal (also called blue opal) is a semi-opaque to opaque blue-green stone found in Peru, which is often cut to include the matrix in the more opaque stones. It does not display a play of color. Blue opal also comes from Oregon and Idaho in the Owyhee region, as well as from Nevada around the Virgin Valley. [16] Opal is also formed by ...

  5. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    Jewellery (or jewelry in American English) consists of decorative items worn for personal adornment such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewellery may be attached to the body or the clothes. From a western perspective, the term is restricted to durable ornaments, excluding flowers for example.

  6. Pylos Combat Agate - Wikipedia

    en.wikipedia.org/wiki/Pylos_Combat_Agate

    It consists of an amygdaloid (almond-shaped) sealstone of banded agate, with gold caps, measuring 3.6 cm in length (1.4 in) and was found alongside four gold signet rings. [ 4 ] [ 5 ] Though the site was discovered in 2015, the agate, then covered in calcium carbonate encrustations, would not be revealed until 2017 as other finds from the site ...

  7. Lapidary - Wikipedia

    en.wikipedia.org/wiki/Lapidary

    They discuss sources of gems and diamonds, their origins, qualities, testing, cutting and polishing, and making jewelry from them. [10] [11] [12] Several other Sanskrit texts on gems and lapidary arts have been dated to post-10th century, suggesting a continuous lapidary practice. [13]

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