Process of Casting silver Jewellery A two-step process, investment casting, produces small, complex shapes. Most castings, especially large ones, are made in sand molds. Permanent metal molds are used to make many small, simple parts; shell molding gives greater accuracy for a large volume of semi precision parts.Molten silver is poured into the cavity and allowed to solidify. Sand, mixed with a binder to hold it together, is pressed around a wooden pattern that leaves a cavity in the sand. Wax or plastic replicas of the parts are molded in accurate metal molds. Top of the line casting equipments are utilized to produce the silver jewellery. When the whole mold is heated, the replica melts, leaving behind a cavity into which silver is poured. Care for Antique Gemstones Gemstones are a valuable part of any piece of antique jewellery. Common sense is the best preventative measure when caring for any antique gemstone. Although the metal components of ornaments often receive the most attention, gemstone care is equally as important.Hairdryers should never be used to dry freshly-cleaned gemstones, and no pieces should ever come in contact with chlorine. It is crucial to protect antique jewellery as a whole, in order to maintain as much value as possible over time. All gemstones have some characteristics Many gemstones are used in even the most expensive jewellery depending on the brand name of the designer, fashion trends, market supply, treatments etc. Others are too common and are given a semi-precious status. Most gemstones have good hardness and a high index of refraction.All gemstones have some characteristics falling short of perfection though; even the seemingly perfect Diamond has four directions of cleavage. Since quartz is everywhere especially in common dirt and dust. Any material that is softer may be scratched during ordinary wear. Nevertheless, diamonds, rubies, sapphires and emeralds still have a reputation that exceeds those of other gemstones.
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