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When buying or examining jewelry, oftentimes there are a lot of markings on the back of the pieces. To help you understand these important stamps or jewelry hallmarks— and gold ring trademarks which metals are fine, pure, and worth the higher price tag— we outlined the most frequently used hallmarks. To clarify two frequently used terms: A carat equals milligrams.

A karatmeanwhile, is a unit measuring the purity of gold. Gold jewelry is most commonly an alloy metal or a mixture of pure gold and a second, bonding metal. These numbers, especially karats, are important to understand when examining jewelry for authenticity and to recognize the specifications of your jewelry. On most quality jewelry, the specifications of your jewelry like gold karat will appear as a hallmark, or a stamp gold ring trademarks several on the back or underside of the piece.

Hallmarks connote the purity or fineness of the precious metals. Common Gold Jewelry Hallmarks Pure gold is 24 karats and is stamped as to indicate its higher gold to alloy ratio. Gold ring trademarks we move down the scale of gold purity, 20 karat gold is stamped as to represent the To simplify the other commonly used gold hallmarks, here is a handy chart of the caratage hallmarks gold ring trademarks the gold purity they correspond to:.

Common Platinum Jewelry Hallmarks Just like gold, platinum is measured by its fineness. But, unlike gold ring trademarks, platinum is not measured in karats. Instead, it is measured by its purity percentage. The fineness hallmarks for platinum are as follows:. Common Silver Jewelry Hallmarks While silver is pure, sterling silver is an alloy of pure silver and another metal.

Therefore when it comes to silver hallmarks, silver is measured by its fineness and marked accordingly. Here is a breakdown of the other common silver hallmarks:. Home Education Decoding Jewelry Hallmarks. What is the difference between carat and karat?

To simplify the other commonly used gold hallmarks, here is a handy chart of gold ring trademarks caratage hallmarks and the gold purity they correspond to: The fineness hallmarks for platinum are as follows: Here is a breakdown of the other common silver hallmarks: Join Our Mailing List.

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Black Hills Gold Jewelry is made by several companies. Gold Diggers covers our items with a lifetime warranty against manufacturing defects and faults in materials of the jewelry we make. The details are clearly posted here on our website and in the certificate of authenticity we ship with each order.

You can tell if an item is from Gold Diggers by our trademark. The trademarks represent in a way the history of their company. Before that time the BHGJ stamp designated abbreviations of the company name. The next two symbols were added when the Landstrom company purchased the F. Thorpe company who had used those trademarks for many years before that time. The address for the Landstroms Black Hills Gold company is at. They are located at. Black Hills Gold Rings. Black Hills Gold Earrings.

Black Hills Gold Pendants. Black Hills Gold Bracelets. Every item we make proudly bears our trademark and the gold 10Kt stamp on gold items or the. If you have a Black Hills Gold item bearing the mark of another manufacturer, for your convenience we list the other trademarks and contact information for those manufacturers.

Landstrom's Black Hills Gold holds several trademarks by which their products can be recognized. Shown here are drawings of those trademarks.

They may be contacted by phone at: They are located at South Highway 16 Rapid City, South Dakota and may be contacted by phone at Dakota Gold manufactures Black Hills Gold Jewelry at 5th Avenue Belle Fourche, South Dakota and can be reached by phone at sorry, no toll free available They have a sunburst trademark as shown in the picture below.

Many Black Hills Gold manufacturers have disappeared over the course of time. Below is a list of those manufacturers and the trademarks by which their jewelry was known.