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.
Hematite gets its name from the Greek word meaning “blood-like” because of the red color of its powder. American Indians used to crush hematite and mix it with animal fat to produce red and brown paint for their artwork and bodies. Interestingly, red hematite is essentially rust. Its reddish brown and orange colors appear when its high iron content comes into contact with water and oxygen. But when the stone is smooth and polished, hematite features a beautiful steel gray color with a metallic and earthy luster. It is this exquisite gray color that is most often used in jewelry.
Although both red and gray hematite is common on Earth, it also occurs everywhere on Mars, making it responsible for the planet's distinctive red color. The reddish landscape of Mars is due to the oxidized iron on its surface, proving that water and oxygen must have been present on the Red Planet at one time. In 2004, NASA's Mars rover Opportunity discovered small spheres believed to be made partly or mostly of hematite, proving that Mars was once a wetter world long ago.
Grey hematite usually forms over long periods of time in the presence of liquid water. It is typically found in layers at the bottom of standing water, such as lakes or mineral hot springs. Hematite can also occur as the result of volcanic activity. While England is the best-known supplier, hematite is also found in Germany, Norway, Sweden, Spain, Brazil, New Zealand and the United States.
Hematite is the most important source of iron ore in the world, which leads to the production of steel, and is therefore vital to the economy of major countries. Because of its high iron content, hematite has magnetic attraction. It is often fashioned into carvings, cameos, intaglios and beads and ranks a hardness of 5.0-6.5 on the Mohs Scale.
It was once believed that large deposits of hematite were formed in places where battles had been fought. The subsequent blood that flowed into the ground was thought to turn into the stone. Hematite is a symbol for the Roman god of war and is thought to be a stone of protection, a belief originating from the Roman belief that it could strengthen warriors going into battle. Ancient warriors even used to rub their bodies with hematite believing it would protect them.
Since the silvery-gray stones can be polished to such a high sheen, they were long ago used as mirrors. Because of this reflective quality, it is believed today to help deflect the emotions of others. It is said to deepen the connection between spirit and body while balancing yin/yang energies and emotions. Folklore also says that hematite can transform and dissolve negativity. It is considered an excellent “worry stone” with emotional grounding properties that calm the mind and clear it of stress. Hematite is also thought to be a “lawyer’s stone” that brings positive judgments and helps one remain true to his or her inner self.