Gold Filled Process

Gold-filled jewelry (also called gold overlay) is composed of a solid layer of gold bonded with heat and pressure tGold-filled jewelry (also called gold overlay) is composed of a solid layer of gold bonded with heat and pressure to a base metal such as brass. Some high quality gold-filled pieces have the look, luster, and beauty of 14 karat (58%) gold. By definition, the minimum layer of karat gold in an item stamped GF must equal at least 1/20 the weight of the total item. 1/20 12kt GF is the most common stamp you will find on gold-filled jewelry. 10kt and 14kt are also common karatages. Gold filled items, even with daily wear, can last five to 30 years but will eventually wear through. The gold layer on gold-plated jewelry varies greatly depending on manufacturer, so there is no single, simple comparison. Gold-filled items are 50 to 100,000 times thicker than regular gold plating, and 17 to 25,000 times thicker than heavy gold electroplate (sometimes stamped HGE or HGP -- usually found on flashy cubic zirconia "cocktail rings").

Sterling silver is an alloy of silver containing 92.5% pure silver and 7.5% other metals, usually copper.
The sterling silver standard has a minimum millesimal fineness of 925.

Pair of sterling silver forks.Fine silver (99.9% pure) is generally too soft for producing large functional objects;
therefore, the silver is usually alloyed with copper to give it strength, while at the same time preserving the ductility and
beauty of the precious metal. Other metals can replace the copper, usually with the intent to improve various properties of the
basic sterling alloy such as reducing casting porosity, eliminating firescale, and increasing resistance to tarnish.

These replacement metals include germanium, zinc and platinum, as well as a variety of other additives, including silicon and boron.

A number of alloys have appeared in recent years, formulated to lessen firescale or to inhibit tarnish, and this has sparked heavy competition
among the various manufacturers, who are rushing to make claims of having the best formulation. However, no one alloy has emerged to replace copper
as the industry standard, and alloy development is a very active area. 

Gold plating of silver is used in the manufacture of jewelry. Like copper, silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface. This process may take months and even years, depending on the thickness of the gold layer. A barrier metal layer is used to counter this effect. Copper, which also migrates into gold, does so more slowly than silver. The copper is usually further plated with nickel. A gold-plated silver article is usually a silver substrate with layers of copper, nickel, and gold deposited on top of it.

Our company DVN GROUP has proved that the alloy we use is 100% Tarnish free, as far as comparision with any manufacturing unit in world.