Sterling Silver Prasiolite (Green Amethyst)
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.
Prasiolite, also known as vermarine or praziolite, is a transparent green quartz. Quite rare in nature, most prasiolites on the market are heat treated amethysts, which is why they are sometimes called "green amethysts". Not all heated amethysts result in green hued prasiolites, however. Only amethysts from a few select locations, including Montezuma, Brazil and Arizona, will produce prasiolites when heat treated. Naturally occurring prasiolite has been reported in Poland.
Prasiolite is considered by some to be a true collector’s gemstone due to its rarity. Relatively inexpensive, its popularity has grown in recent years with large, clean, color saturated stones as the most valuable and desirable. The color of prasiolite can vary from light yellow-green to deep green, and can look similar to peridot and tourmaline. Ranking 7.0 on the Mohs Hardness Scale, prasiolite is ideal for everyday wear. Clean the stone with warm soapy water and a soft brush while keeping it away from household chemicals. Prolonged exposure to extreme heat or sunlight may cause damage and discoloration. Store your jewelry in a fabric lined box and away from other items and gemstones to avoid scratching.
Derived from the Greek words, “prason” meaning leek, and “lithos” meaning stone, prasiolite was named for its vegetable colored stone appearance. Some believe prasiolite bridges the gap between physical and spiritual aspects of life and attracts prosperity by strengthening the mind and emotions. It is used by some as an aid for issues with the heart, digestion and even eating disorders.