GOLD - It comes in various qualities called Karats that determines the purity: 24K is 100% Gold; 18K is 75%; 14K is 58% and 10K is 49%. Pure Gold is mixed with other metals for strength, durability and/or color - Nickel or Palladium creates White; Copper creates Rose. NICKEL CAN create allergic reactions in some people so 14K PALLADIUM WHITE is a good choice. Rhodium-plating White Gold - done to improve the whiteness BUT many Refiners are creating White Golds that do NOT need Rhodium plating and are Nickel-safe!
Other Precious Metals - PLATINUM is used at 90-95% pure for jewelry and is very dense and heavy. The small % of alloys is for strength/durability. PALLADIUM - a 'kissing cousin' of Platinum, is also of high purity with slightly less durability and a lighter density at a lesser cost. SILVER - used at a purity of 92% and is the least costly of all precious metals. Durability/Strength is the least of all BUT there are new, stronger alloys available - Sterlium and Silvadium are patented silver alloys with high tarnish resistance, higher strength and no nickel reactions.
OTHERS - PLATED many rings (some of non-precious metal) are electroplated with a VERY thin layer of Rhodium, Gold or Palladium for color, but it is NOT durable for extended wear. Gold over Silver is called Vermeille. GOLD FILLED is a process where 1/20th of the total weight of the piece is layered over brass with 14 or 24K Gold. "PRECIOUS BOND" - a patented process where 25% Gold is permanently bonded to 75% Silver to create an affordable Wedding Band.

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