All weights pertaining to gemstones, including diamonds, are minimum weights. Additionally, please note that many gemstones are treated to enhance their beauty. View Gemstone Enhancements and Special Care Requirements for important information.
By far the most common color of gold used in jewelry, yellow gold is gold in its natural shade. Yellow gold is usually alloyed with copper and silver to increase the strength of the metal. How yellow the metal is depends upon the content of gold. A 14-karat piece of jewelry will have a brighter yellow hue than a 10-karat piece. Likewise, an 18-karat piece of jewelry will have a deeper yellow than 14-karat gold, and so on.
Gold's softness and malleability make it a wonderful metal to work with when creating virtually any design in jewelry. But this softness can be a drawback as well. To make it stronger and more durable, gold is usually alloyed, or mixed, with other metals such as copper or silver. The higher a metal's percentage of gold content, the softer and more yellow the jewelry piece. The karat weight system used to measure gold in a piece is the same for all hues, including white and yellow gold.
The word “carat” is Arabic, meaning “bean seed.” This is because historically seeds were used to measure weights of gold and precious stones. In the United States, “karat” with a “k” is used to measure gold's purity, while “carat” with a “c” is used in measuring a gemstone's size. The karat mark of gold represents the percentage of pure gold to alloy.
In order to determine the karat weight of a specific item, simply look for the quality mark. Jewelry items will bear the stamp of their karatage based upon the United States or European system of marking. The United States system designates pieces by their karats—24K, 18K, 14K, 10K, etc. The European system designates pieces by their percentage of gold content. For instance, 10K gold is marked “417,” denoting 41.7% gold; 14K is marked “585,” denoting 58.5% gold; and 18K is marked “750,” denoting 75% gold; etc.
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.