K white gold is a blend metal of gold and other white metal like Pd, nickel, etc.
WG18K/750-WG is the abbreviative form of WHITE GOLD (literal meaning). While the 18KWG sold by merchants is actually 18K white gold, that is, add 25% Pd or nickel white alloy in the gold, it is one of K gold in nature. The percent of quality that gold accounts for, is K quantity of "K white gold", total quality amounts to 24K.

G14K/585-is K gold made by 58.50% gold and 41.50% other metals.

SV925 silver- type face “S” or“ SILVER” on jelwery, it denotes white silver. “S925” show that the ornament contains 92.50% pure silver.

14K/20L-is the product code of one foreign manufacturer, it means that 20g contains 1g 14 K gold, or gild.

GP-the abbreviative form of Gold Plating, gild in literal Chinese meaning.

Copperized gold-- generally its gild thickness as 0.1um or so, its color fades away soon due to thinness.

Plated 1um 18K gold-as the hardness of 18K gold is higher than that of pure gold, it friction resistance is excellent. If the ornament and buckle with 18K gold of 1um thickness, it has longer useful life.

Plated 3um 18K gold, similar to numerous international brands, “SUM^®鑫得宏^® ” products' general gild thickness amounts to 3um18K gold, which has strong friction resistance and long useful life.

Plated white gold: only with Rh element on the jewelry, can it be called plated white gold. Its characteristic as follows:

（1）Rh is noble metal with friction resistant, strong acid and alkali resistant, plated Rh is very stable in the air;

（2）Rh is more expensive and top grade than platinum (also called white gold), “SUM^®鑫得宏^®” products are all plated Rh;

（3）Pure white and bright tint of Rh plating.

The popular plating white gold products in the market usually take plated nickel, white steel or mimic white white gold, they have such features like low cost, bad friction resistant and corrosion resistant, darker tint, color tangibility easily. Additionally human skin is allergic to nickel.