The spring princess
Medalion din argint cu piatra semipretioasa chrysopraze (chrysoprase stone)
Dimensiuni: ~ 4,5 cm / 3 cm
Chrysoprase is a distinct gemstone quality variety of chalcedony quartz, a cryptocrystalline form of silicon dioxide. Chrysoprase is highly prized for its opalescent minty, apple-green color, which is especially unique and is owed to its distinctive coloring agent. Most green gemstones are colored by iron (tourmaline), chromium (emerald) or vanadium (tsavorite garnet), but chrysoprase derives its alluring color from nickel impurities, which form within otherwise colorless quartz crystal. Chrysoprase is considered to be one of the rarest and most valuable varieties of chalcedony quartz, second only to the rare green-blue gem silica, which is also known as ‘chrysocolla chalcedony’.
The name ‘chrysoprase’ originates from the Greek words, ‘chrusos’ and ‘prason’, meaning ‘gold’ and ‘leek’, respectively; referring to its leek-green color and the presence of golden inclusions. Chrysoprase frequently occurs in quartz veins of nickel-bearing serpentine rocks and in weathered deposits of nickel ore materials. Chrysoprase, like all other varieties of cryptocrystalline quartz, is composed of crystals that are too fine to be seen as distinct particles, even under magnification. Unlike most chalcedony quartz varieties that are prized for their multi-colored patterns, chrysoprase is desired for its solid and vivid green color, which is reminiscent of the finest quality jade.
Chrysoprase color can range from light, minty-green to intense deep, apple-green color. Deeper colors are considered more desirable, but once the color reaches a certain depth, the stone may be classified as ‘prase’, which is not as desirable as chrysoprase. Chrysoprase color can fade under prolonged exposure to heat or direct light, but in many cases, the color may be restored after absorption of moisture.
Chrysoprase Clarity and Luster
Chrysoprase is typically translucent to opaque. Translucent specimens are considered most valuable. When cut and polished, it has a vitreous to waxy luster. Most chrysoprase forms very clean with regard to clarity, but an uneven, cloudy distribution of color is quite common.
Chrysoprase Gemstone and Jewelry Care and Cleaning
Chrysoprase is considered to be one of the harder gems. Since it has no cleavage, it is quite durable, but it can still be easily scratched by harder materials such as topaz, spinel and diamond. The color of chrysoprase can fade if exposed to direct sunlight or extreme heat for prolonged periods of time, so care should be taken to avoid any excess or direct exposure to harsh conditions, which can damage the color of your gemstones. Chrysoprase can be easily cleaned using warm, soapy water and a soft cloth or brush. Be sure to rinse well to remove any soapy residue.
Owing to the natural porosity of chrysoprase, it can be easily dyed or stained by the absorption of other chemicals and colors. Therefore, avoid the use of any harsh household chemicals, especially bleach, perfume and sulfuric acid. Always remove any gems and jewelry before exercising, playing sports or performing household chores. When storing chrysoprase gemstones, wrap them using a soft cloth and place them inside a fabric-lined box for added protection.ComandaLike