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Rio Grande, a Berkshire Hathaway Company since 2013, offers jewelry-making supplies. While specializing in silver findings and fabrication materials, the company also provides metalsmithing tools and equipment, jewelry displays and packaging products, jewelry workbenches, casting machines and kilns, soldering and welding torches, gemstones ...
Variscite has been used in Europe to make personal ornaments, especially beads, since Neolithic times. Its use continued during the Bronze Age and in Roman times although it was not until the 19th century that it was determined that all variscite used in Europe came from three sites in Spain, Gavá (Barcelona), Palazuelo de las Cuevas (Zamora), and Encinasola (Huelva).
Native American jewelry can be made from naturally occurring materials such as various metals, hardwoods, vegetal fibers, or precious and semi-precious gemstones; animal materials such as teeth, bones and hide; or man-made materials like beadwork and quillwork. Metalsmiths, beaders, carvers, and lapidaries combine these materials to create jewelry.
The most significant archaeological evidence comes from the Royal Cemetery of Ur, where hundreds of burials dating 2900–2300 BC were unearthed; tombs such as that of Puabi contained a multitude of artefacts in gold, silver, and semi-precious stones, such as lapis lazuli crowns embellished with gold figurines, close-fitting collar necklaces ...
Ancient and Renaissance cameos were made from semi-precious gemstones, [3] especially the various types of onyx and agate, and any other stones with a flat plane where two contrasting colours meet; these are "hardstone" cameos.
Cubic zirconia is relatively hard, 8–8.5 on the Mohs scale—slightly harder than most semi-precious natural gems. [1] Its refractive index is high at 2.15–2.18 (compared to 2.42 for diamonds) and its luster is Adamantine lustre. Its dispersion is very high at 0.058–0.066, exceeding that of diamond (0.044).
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