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2. Rhodium - Wikipedia

   en.wikipedia.org/wiki/Rhodium

   Rhodium is a hard, silvery, durable metal that has a high reflectance. Rhodium metal does not normally form an oxide, even when heated. [25] Oxygen is absorbed from the atmosphere only at the melting point of rhodium, but is released on solidification. [26] Rhodium has both a higher melting point and lower density than platinum.

3. Pennino Brothers Jewelry - Wikipedia

   en.wikipedia.org/wiki/Pennino_Brothers_Jewelry

   Pennino Brothers Jewelry was a United States jeweller founded by Oreste, Frank and Jack Pennino in 1926 and based in New York City. It designed and manufactured costume jewelry using rhinestones set in gold plate, sterling, vermeil or rhodium-plated base metal. Many of these pieces were made by Italian immigrants, such as Adrian Scannavino and ...

4. Plating - Wikipedia

   en.wikipedia.org/wiki/Plating

   Plating is a finishing process in which a metal is deposited on a surface. Plating has been done for hundreds of years; it is also critical for modern technology. Plating is used to decorate objects, for corrosion inhibition, to improve solderability, to harden, to improve wearability, to reduce friction, to improve paint adhesion, to alter conductivity, to improve IR reflectivity, for ...

5. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   Rhodium-plated white gold wedding ring. The word white covers a broad range of colors that borders or overlaps pale yellow, tinted brown, and even very pale rose. White gold is an alloy of gold and at least one white metal (usually nickel, silver, platinum or palladium). [5] Like yellow gold, the purity of white gold is given in karats.

6. Precious metal - Wikipedia

   en.wikipedia.org/wiki/Precious_metal

   Although both have industrial uses, they are better known for their uses in art, jewelry, and coinage. Other precious metals include the platinum group metals: ruthenium , rhodium , palladium , osmium , iridium , and platinum , of which platinum is the most widely traded. [ 1 ]

7. Electroplating - Wikipedia

   en.wikipedia.org/wiki/Electroplating

   Electroplating of acid gold on underlying copper- or nickel-plated circuits reduces contact resistance as well as surface hardness. Copper-plated areas of mild steel act as a mask if case-hardening of such areas are not desired. Tin-plated steel is chromium-plated to prevent dulling of the surface due to oxidation of tin.