Lapidary Gemstone
Lapidary Gemstone
The Fire Opal Of Mexico
In the world of colored gemstones it is color which matters most, and a number of gemstones with outstanding color are highly regarded despite having some fairly obvious shortcomings. Opal is a good example.
All of the opals have a variety of gemstone characteristics which are, let us say, less than ideal. These include softness, a tendency to dehydrate and crack, physical weakness and sensitivity to heat and chemicals. They are the most delicate gemstones commonly worn. But despite these shortcomings, they continue to be very popular because of their unique color.
The traditional precious opal, with its unique play of color, has been valued since Ancient Rome. During the Middle Ages, precious opal was regarded as especially lucky because it displayed the colors of many different gemstones. Not every culture has had the same view, however. A well-known Russian superstition associates precious opal with the evil eye.
Recently we have seen growing interest in one of the lesser know opals, the so-called fire opal. This is an opal known not for its play of color, but for its vivid body color, which ranges from white to yellow to orange to red.
Like all opals, the fire opal is amorphous hydrated silicon dioxide. "Amorphous" indicates that opal has no crystalline structure; "hydrated" means that it contains water, typically from 3 to 10%. Opal is actually considered to be a kind of hardened jelly. But fire opal has some unusual characteristics not shared by other opals.
Opal is typically opaque and is cut en cabochon. Fire opal is the only kind of opal that can be transparent to translucent, and you will often find the higher-grade material cut in facets. People seeing these gems for the first time are often surprised to find out that they are opals.
The color range of fire opal can be can quite wide, and some pieces display multiple colors in a single stone. The brilliant sunny yellows are highly regarded, but it is the more saturated orange and orange-red which is especially valuable.
Fire opal is associated especially with Mexico, and is mined in the Mexican states of Queretaro, Hidalgo, Guerrero, Michoacan, Julisio, Chihuahua and San Luis Potosi. The most important mines in Queretaro were discovered in 1835 and are still producing today. Small quantities of fire opal can also be found in Oregon, USA and British Columbia, Canada.
Since fire opal has a high water content, it should be protected from heat and prolonged exposure to strong light, which could dry it out. Lapidaries cure fire opal by drying it before cutting to make reduce instability, so it is actually not that delicate. But due to its relative softness (5.5 to 6.5 on the Mohs scale), it is best suited for pendants, earrings and brooches, not rings.
About the Author
GemSelect is a leading online dealer in fine gemstones, specializing in sapphire, spinel, fire opal and zircon. Buy Precious Gemstones Online
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Knowledge of Jewelry Making
In the creation of jewelry, precious stones, coins or other valuables are often used and is generally defined precious metals. Alloys of nearly every metal known have been encountered in jewelry - bronze, for example, was common in Roman times. modern jewelry it usually includes gold, white gold, platinum, palladium, titanium or silver. Most gold jewelry in America and Europe is made of an alloy of gold, the purity of carats, indicated by a number followed by the letter K. gold jewelry U.S. must be at least 10K purity (41.7% pure gold), (even if the United States Kingdom, the number is 9K (37.5% pure gold) and is generally 18 karat (75% pure gold). The highest purity levels are less common with alloys of 22 K (91.6% pure gold) and 24 K (99.9% pure gold) is considered too soft for jewelry use in America and Europe. These high purity alloys, however, are largely used in Asia, the Middle East and Africa. platinum alloys range from 900 (90% purity) to 950 (95.0% purity). The silver used in jewelry is usually money, or 92.5% fine silver. In costume jewelry, stainless steel results are sometimes used.
Other materials used are glass, glass fuses or enamel, wood, often carved or turned, shells and other animal products natural disasters such as bone and ivory, natural clay, polymer clay and even plastic. hemp ropes and others have also been used to create jewelry that has more of a natural feeling. However, any inclusion of lead or lead solder English test will be an office (the building which gives English jewelry its seal of approval, seal) to destroy the room.
The accounts are often used in jewelry. These can be glass, precious stones, metals, wood, shells, clay and polymer clay. beaded jewelry often includes necklaces, bracelets, earrings earrings, belts and rings. The beads can be large or small, the smallest type of beads used are known as seed beads, these are the accounts used for the "woven" style of beaded jewelry. Another use of beads is an embroidery technique in pearls are sewn into the lining fabric to create Large parts of the neck collar and pearl bracelets. Beadwork, a popular type of labor in the Victorian era is enjoying a renaissance in modern jewelry manufacturing. Pearls, or pearls, is also very popular in many African cultures.
Advanced glass and Glassmasters BEADMAKING Murano glass art and Venice developed crystalline glass, enameled glass (Smalto), glass with gold son (Goldstone), multicolored glass (millefiori) glass of milk (Lattimer) and False glass gems. Already in the 13th century, Murano glass and Murano beads were popular.
Goldsmith, jewelers, jewelers and methods include forging, casting, soldering or welding, cutting, shaping and "cold joining" (using adhesives, staples and rivets to assemble parts).
About the Author
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