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2. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   Diagram of a gold-filled object A watch made from gold-filled metal. Gold-filled is a type of composite material. Composites are formed from two or more constituent materials with different properties that, when combined, create a new material with enhanced properties. [1] Gold-filled material is made by bonding a layer of gold alloy to a base ...

3. Gold plating - Wikipedia

   en.wikipedia.org/wiki/Gold_plating

   Gold plated - gold layer thickness greater than or equal to 0.5 micron; Heavy gold plated / Vermeil - gold layer thickness greater than or equal to 2.5 micron; Gold plated silver jewellery can still tarnish as the silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface ...

4. Fineness - Wikipedia

   en.wikipedia.org/wiki/Fineness

   For example, knowing that standard 18-carat yellow gold consists of 75% gold, 12.5% silver and the remaining 12.5% of copper (all by mass), the volume of pure gold in this alloy will be 60% since gold is much denser than the other metals used: 19.32 g/cm 3 for gold, 10.49 g/cm 3 for silver and 8.96 g/cm 3 for copper.

5. Conservation and restoration of silver objects - Wikipedia

   en.wikipedia.org/wiki/Conservation_and...

   Silver is known in the chemistry world as a noble metal, which means it is resistant to corrosion, but not completely immune. Whether silver plating or pure silver, the composite of the metal will tarnish when exposed to air and sulfur. Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of ...

6. The 12 best places to buy jewelry online in 2025 - AOL

   www.aol.com/lifestyle/best-places-to-buy-jewelry...

   Best for tarnish-free jewelry: ... Many of its designs are made from gold-plated sterling silver, which makes them hypoallergenic, and the brand also offers many customizable styles that can be ...

7. Jewellery cleaning - Wikipedia

   en.wikipedia.org/wiki/Jewellery_cleaning

   Jewelry made from gold and sterling silver are examples of jewelry that can be cleaned at home, while platinum should not be due to how at-risk platinum is of scratching. Jewelry with gemstones such as diamonds or sapphires can be cleaned at home as well using mild soap and warm water.

8. Toning (coin) - Wikipedia

   en.wikipedia.org/wiki/Toning_(coin)

   A Morgan dollar with iridescent toning. Toning on a coin is the change of colour brought about through oxidization, which forms a thin layer of tarnish on the metal's surface, typically as a result of interactions and chemical reactions with sulfur-containing compounds in the environment.

9. Silver-gilt - Wikipedia

   en.wikipedia.org/wiki/Silver-gilt

   Silver-gilt or gilded/gilt silver, sometimes known in American English by the French term vermeil, is silver (either pure or sterling) which has been gilded.Most large objects made in goldsmithing that appear to be gold are actually silver-gilt; for example, most sporting trophies (including medals such as the gold medals awarded in all Olympic Games after 1912) [1] and many crown jewels are ...