SterlingSilver Mother-of-Pearl Marcasite
Sterling silver, also called fine silver, is a beautifully lustrous cool-toned precious metal favored in fine jewelry among other products. The most reflective of all metals (excluding mercury), sterling silver looks stunning by itself and brings out the best hues in an array of colorful gemstones.
Sterling silver can be polished to a higher sheen than platinum. In fact, Ag, the chemical symbol for silver, comes from a word that means “white and shining.” The surface of silver can boast that shiny, polished appearance, or can be brushed, satin, matte, sandblasted, antiqued or oxidized (chemically blackened).
In order to be called sterling silver, a metal must be made up of a minimum of 92.5% pure silver and 7.5% alloy (meaning other metals), including but not limited to copper and nickel. The alloy is added to pure silver to make the metal more durable, tougher and harder. Sterling silver is designated a fineness of “925.” Pieces with sterling silver may be marked “sterling.”
Finishes on Sterling Silver
Rhodium Plating: Rhodium plating is a complex and laborious process that enhances the luster and beauty and extends the life of silver. A member of the platinum metal group, rhodium is often used as a finishing touch on silver jewelry. It's a shiny silvery metal with a very white and reflective appearance, much like mercury. It's also very hard, so it withstands much wear and tear, resists natural tarnishing and wonderfully mimics the brilliant finish of freshly polished silver.
Finishing, or plating, is a common treatment with sterling silver. Popular types of plating are rhodium plating, gold plating and anti-tarnish plating. Plating is used to extend the life and sheen of the jewelry. After sizing or buffing a piece of jewelry with a machine, it must be re-plated to restore the finish.
Caring for Sterling Silver
Avoid exposing sterling silver to direct sunlight and harsh chemicals, including chlorine, ammonia, hair products, perfumes, cosmetics, perspiration and strong jewelry cleaning solutions.
Periodically wash sterling silver with mild dish soap and warm water. Rinse well and dry completely with a soft cloth before storing because moisture can cause tarnish.
Lightly polish sterling silver frequently with a soft silver-polishing cloth, avoiding abrasive cloths completely.
Tarnish is easy to remove when it first forms as a yellowish tint, but becomes more difficult to remove when it becomes brown and black. Remove tarnish with a silver polish cream, avoiding immersing pieces with gemstones in tarnish-removal solutions.
Minimize scratches on sterling silver by storing it in its own compartment in your jewelry box or in a cloth pouch. Sterling silver may also be stored in sealed polyethylene bags.
Sterling silver becomes tarnished as the result of a natural chemical process that occurs when sterling silver is exposed to chemicals in the air, rubber, wool and latex. Humidity also plays a role in accelerating tarnishing. It's easy to keep your sterling silver sparkling, though, by taking a few steps to prevent tarnish and other wear and tear.
Mother-of-pearl is found on the shells of mollusks, such as mussels and oysters, and the shells of pseudopods, such as snails. When the young of these creatures come into the world, they create a shell “house” in order to preserve their existence. The walls of this housing are formed with layers their of secretions, ensuring a simultaneous growth of house and creature together.
Depending on the type of animal and the environment in which it lives, secretions create various shapes and colors found on the different types of mother-of-pearl. “White” mother-of-pearl comes from pearl-bearing oysters. It features high reflective properties and is one of the most commonly used types of this material. “ Iridescent” mother-of-pearl is a type in which the colors of pink and green are predominant, while “variegated” mother-of-pearl is a multicolored type. “Stone” mother-of-pearl is white with a low reflective power, while “mat” mother-of-pearl is dull grey and also has a low reflective power.
The shiny quality of mother-of-pearl has attracted attention for thousands of years. The Louvre Museum features mother-of-pearl objects that belonged to the Sumerians and were found in Mesopotamia. In China, a dish with geometric-shaped pieces of mother-of-pearl was found that belonged to the Tang Dynasty in 618-906 A.D. Mother-of-pearl work was also common in ancient Italy, Greece and Cyprus. Today, different types of mother-of-pearl are commonly used in the art world. This type of art is certainly a challenge, for in order for them to be made into works of art, the mother-of-pearl pieces must be thick enough to withstand being worked upon and be of high enough quality to beautifully reflect colors of the rainbow.
Marcasite, a name derived from the Arabic word for pyrite, is the term applied to small polished and faceted stones inlayed in sterling silver. Their color is usually described is being pale bronze, looking rather gray with a greenish tint. A multi-colored tarnish may exist as a result of oxidation. With a metallic luster and opaque crystals, marcasite ranks 6.0-6.5 on the Mohs Scale. Occurrences are worldwide, especially in the United States, Mexico, France, Peru, China and Russia.