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Jewellery cleaning
Jewelry cleaning is the practice of removing dirt from jewelry to improve its appearance.
== Methods and risks ==
Maintaining a clean diamond can be sometimes be difficult, as jewelry settings can obstruct cleaning efforts, and oils, grease, and other hydrophobic materials adhere well to a diamond's surface. Some jewelers provide their customers with sudsy ammonia cleaning kits. Many jewelers use steam cleaners. Some other jewelers sell small ultrasonic cleaners. Home-based cleaning methods include immersing the diamond in ammonia-based or ethyl alcohol-based solutions, or even a solution of mild grease dissolving detergent and warm water. Silver jewelry can be cleaned using aluminium foil, baking soda, and hot water. However, this practice is not recommended by most jewelers.
Certain types of cleaning can damage some jewelry. For example, some class rings are coated with a dark pigment, called antiquing, to darken their appearance. A lot of artisan sterling silver jewelry is oxidized to give it an intentionally rustic or industrial look and improper cleaning may remove that oxidation. 〔http://www.valerietylercollection.com/blogs/valerie-tyler-collection-blog/50372675-jewelry-care-tips〕Some gemstones, such as white topaz, have an overlay to produce certain colors. Ultrasonic cleaning can remove this coating, if it is not a quality piece. Ultrasonic cleaning is also contraindicated for opals, pearls and amber, and any other gemstone that is porous. Gemstones that are glued in (a common practice with semiprecious stones in non-precious methods and in class rings) should not be placed into an ultrasonic cleaner. An ultrasonic cleaner can cause stones that are loose in their settings to come out. Jewelry should always be examined for overlays and loose stones prior to cleaning with an ultrasonic cleaner or a steam cleaner.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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