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  2. Engagement ring - Wikipedia

    en.wikipedia.org/wiki/Engagement_ring

    Engagement rings in India are often part of elaborate jewelry sets exchanged during traditional ceremonies. These rings, typically crafted from gold, align with cultural preferences for ornate and symbolic designs. [57] In Japan, engagement rings are known for their minimalist and high-quality designs. This reflects Japan's cultural preference ...

  3. Cubic zirconia - Wikipedia

    en.wikipedia.org/wiki/Cubic_zirconia

    In 1977, cubic zirconia began to be mass-produced in the jewelry marketplace by the Ceres Corporation, with crystals stabilized with 94% yttria. Other major producers as of 1993 include Taiwan Crystal Company Ltd , Swarovski and ICT inc. [ 8 ] [ 5 ] By 1980, annual global production had reached 60 million carats (12 tonnes) and continued to ...

  4. 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 ...

  5. Zirconium - Wikipedia

    en.wikipedia.org/wiki/Zirconium

    Zircon (ZrSiO 4) and cubic zirconia (ZrO 2) are cut into gemstones for use in jewelry. Zirconium dioxide is a component in some abrasives , such as grinding wheels and sandpaper . [ 49 ] Zircon is also used in dating of rocks from about the time of the Earth's formation through the measurement of its inherent radioisotopes , most often uranium ...

  6. Commemorative coins of the Czech Republic - Wikipedia

    en.wikipedia.org/wiki/Commemorative_coins_of_the...

    The Czech National Bank issues 200 / 500 Koruna (Kč) silver commemorative coins and golden commemorative coins of various denominations. The golden coins are issued in thematic sets – Bohemian crown set, Charles IV set, Ten centuries of architecture set, Industrial Heritage Sites set and Bridges in the Czech Republic set.

  7. GOLD - Wikipedia

    en.wikipedia.org/wiki/GOLD

    Gold, a chemical element; Genomes OnLine Database; Global-scale Observations of the Limb and Disk, a NASA Explorer Mission of Opportunity; GOLD (parser), an open-source parser-generator of BNF-based grammars; Graduates of the Last Decade, an Institute of Electrical and Electronics Engineers program to garner more university level student members

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