The numbers and letters on jewelry indicate the metal and karat weight of the jewelry, and sometimes the stone. The exceptions are the low numbers, 6 through 10, because those are ring size marks.
As new alloys are added to the jewelry-making industry, the list of marks inside jewelry grows. Common marks, however, include numbers beside a letter "k," such as 14k for 14-karat gold, and 24k for 24-karat gold. In less expensive jewelry, SS is a common marking, indicating the item is made of stainless steel. Sometimes, stones are also noted in the markings, with SOL indicating a diamond solitaire, and CW indicating carat weight of the stones.Learn More
Metal is usually engraved through a process involving a diamond drag engraving tool that pushes slivers of metal to each side of the tool so a simple message may be added to a piece of jewelry. Amateurs often mistake a particularly neat engraving for some form of printing process as the words are so clear, but no inks or dyes are used.Full Answer >
To polish metal, you need a buffing compound and a revolving buffing wheel. Choose the buffing compound for the type of metal you are polishing. Apply a light amount of the compound onto the buffing wheel and press the wheel onto the metal surface with slight pressure until shiny. Repeat the process if the metal is still dull.Full Answer >
When metal is heated, the atoms begin to vibrate. This increased motion causes the atoms to move farther apart. When the atoms move farther apart, the metal expands. This tendency for metals to expand when heated is called thermal expansion.Full Answer >
Copper is a highly conductive, ductile metal. The metal is soft and malleable, although it does possess a great deal of tensile strength. This means that copper is easily formed by hand, but it is not suitable for building structures.Full Answer >