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  2. Glass code - Wikipedia

    en.wikipedia.org/wiki/Glass_code

    The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index n d at the Fraunhofer d- (or D 3-) line, 589.3 nm, and its Abbe number V d also taken at that line.

  3. Bombardier Electrostar - Wikipedia

    en.wikipedia.org/wiki/Bombardier_Electrostar

    Class 375 and 377 differ only in their coupler configuration and other minor fittings; all Southern units built as Class 375 have since been converted to Class 377 couplers and re-classed. Minor differences in interior trim remain. [citation needed] 376 Electrostar: Southeastern: 2004: 36: DC electric: 5: Sliding pocket: No: 377 Electrostar

  4. List of jewellery types - Wikipedia

    en.wikipedia.org/wiki/List_of_jewellery_types

    This page was last edited on 6 February 2025, at 11:20 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  5. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    These may be made of glass, gemstones, metal, wood, shells, clay and polymer clay. Beaded jewellery commonly encompasses necklaces , bracelets , earrings , belts and rings . Beads may be large or small; the smallest type of beads used are known as seed beads , these are the beads used for the "woven" style of beaded jewellery.

  6. Body piercing materials - Wikipedia

    en.wikipedia.org/wiki/Body_piercing_materials

    This can cause problems; due to this, many change their jewelry to others made of horn, bone, wood, plastics and glass during winter. Steel body jewelry may be sterilized in an autoclave. The two most common standards that apply to body jewelry made of steel are ASTM F138 [1] and ISO 5832-1 [2] which describe the qualities of steel for surgical ...

  7. Gemological Institute of America - Wikipedia

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

    Through its library and subject experts, GIA acts as a resource of gem and jewelry information for the trade, the public and media outlets. [ 2 ] In 1953 the GIA developed its International Diamond Grading System and the "four Cs" ( cut , clarity , color , and carat weight) as a standard to compare and evaluate the quality of diamonds.

  8. Bezel (jewellery) - Wikipedia

    en.wikipedia.org/wiki/Bezel_(jewellery)

    Modern bezel settings typically use a band of metal containing a groove and a flange (i.e. projecting lip) to hold a watch crystal or gemstone in its setting. This was the earliest method of setting gemstones into jewelry. In historic examples, such rings were often made by leaving a hole or slot in the ring with a thin lip which was bent over ...

  9. Art jewelry - Wikipedia

    en.wikipedia.org/wiki/Art_jewelry

    Arts and crafts jewelry also tended to favor materials with little intrinsic value that could be used for their artistic effects. Base metals, semi-precious stones like opals, moonstones and turquoise, misshapen pearls, glass and shell, and the plentiful use of Vitreous enamel, allowed jewelers to be creative and to produce affordable objects. [10]

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