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  2. Foil opal - Wikipedia

    en.wikipedia.org/wiki/Foil_opal

    Foil opals are simulated opal gemstones that first came into vogue during the jewelry-making boom of the late-Victorian era. Across Europe and the United States, these faux gemstones joined their paste counterparts (simulated diamonds, emeralds, rubies and sapphires made from glass) as the need for jewelry outstripped both gemstone availability and nouveau middle-class budgets.

  3. Opal - Wikipedia

    en.wikipedia.org/wiki/Opal

    The black fire opal is the official gemstone of Nevada. Most of the precious opal is partial wood replacement. The precious opal is hosted and found in situ within a subsurface horizon or zone of bentonite, which is considered a "lode" deposit. Opals which have weathered out of the in situ deposits are alluvial and considered placer deposits.

  4. Medieval jewelry - Wikipedia

    en.wikipedia.org/wiki/Medieval_jewelry

    The main material used for jewelry design in antiquity and leading into the Middle Ages was gold. [1] Many different techniques were used to create working surfaces and add decoration to those surfaces to produce the jewelry, including soldering , plating and gilding, repoussé , chasing , inlay, enameling, filigree and granulation, stamping ...

  5. Opalescence - Wikipedia

    en.wikipedia.org/wiki/Opalescence

    Opalescence or play of color is an optical phenomenon associated with the mineraloid gemstone opal, [1] a hydrated silicon dioxide. [2] This effect appears as a milky, translucent glow that changes with the angle of light, often creating a soft, pearly sheen that can display various colors or hues.

  6. Ammolite - Wikipedia

    en.wikipedia.org/wiki/Ammolite

    Ammolite is an opal-like organic gemstone found primarily along the eastern slopes of the Rocky Mountains of North America.It is commonly unearthed by natural erosion or through the process of various mining practices, within the perimeter of an ancient sea bed called the Western Interior Seaway. [2]

  7. Lapidary - Wikipedia

    en.wikipedia.org/wiki/Lapidary

    Lapidary (from the Latin lapidarius) is the practice of shaping stone, minerals, or gemstones into decorative items such as cabochons, engraved gems (including cameos), and faceted designs. A person who practices lapidary techniques of cutting, grinding, and polishing is known as a lapidary or lapidarist.

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