How many different types of turquoise are there? Carico Lake Turquoise. Kingman Turquoise. Lone Mountain Turquoise. Number 8 Turquoise. Number 8 turquoise range in color fromlight blue to blue-green to dark blue. Royston Turquoise. Sleeping Beauty Turquoise. Larimar Stone. Petya Almellones Explainer. How do you clean raw turquoise?
Cleaning Turquoise:. Dampen a clean, soft-bristled toothbrush in clean water. Gently scrub the surface of the stone with the brush. Dry the whole piece well with a soft towel. Polish the jewelry, especially metal parts, with a jewelrypolishing cloth.
Muslim Burkhardt Explainer. How is turquoise made? Chemically, a hydrated phosphate of copper and aluminum, turquoise is formed by the percolation of meteoric orgroundwater through aluminous rock in the presence ofcopper. Ludovico Laborie Pundit. The vast majority of turquoise available is faked synthetic, stabilized, reconstructed, dyed. That is why real turquoise is a treasure.
Turquoise formation demands an arid environment hot and dry and close association with copper deposits. Copper is transported in waters which interact with phosphorus and aluminum-bearing rocks.
Turquoise forms inside the earth within host rocks such as limestone and sandstone under high temperature and pressure, making it as hard as glass. Various combinations of different chemical elements in the host rock material , along with pressure and temperature conditions, can change the appearance and structural integrity of the gemstone, which also strongly changes the price.
The price for turquoise rock is considerably lower than for boulders or cabochons in the form of which turquoise is commonly distributed. Turquoise rock is commonly composed of veins, veinlets, kidney-shaped or grape-like aggregates of turquoise, and a limestone and sandstone matrix. Turquoise forms best in an arid hot and dry climate and that determines the geography of turquoise sources.
The ancient mines of Persia and New Mexico, well-known for their top-quality gemstones, no longer yield significant quantities of turquoise. TIP: Check out the ultimate guide about rockhounding in Arizona in the article below and find out where to go and what rocks you can find in Arizona:. Turquoise occurs in dull gray and weathered yellow hues to grass-greens and bright, medium-toned, sky blue colors.
Different cultures praised the color of their own deposit: however, nobody can withstand the attractive sky-blue evenly distributed color of high-quality turquoise. The most valuable color of turquoise is an intense, uniform, medium blue color. The most valuable intense, evenly distributed, medium blue color is a result of many geological factors to be met.
Perfect color is a sign of high copper concentration and the absence of iron in mineral composition, which usually provides greenish hues. The bright-blue turquoise color means that the stone was not exposed to the sun and was preserved from any weathering.
Perfect sky-blue color can be observed if there are not many matrices present in the sample. Depending on the locality of the market you are trying to buy turquoise, there are different weight measure units. For buyers from Europe, we are kindly providing prices per carat and gram. And for turquoise lovers from the United States, we will indicate prices per ounce and pound.
Turquoise value is rarely expressed in pounds, as such an amount of solid gem material is rare. TIP: Have you ever thought about making money by selling rocks and minerals? You can earn a full-time income by doing this activity. The TQI is a number on a scale between 8 and The higher the TQI number, the better quality the turquoise, the higher the grade and the more valuable the stone.
The TQI scoring system is a great way to get a quick estimate. There are two major components that can be evaluated that contribute the true turquoise value. These components are broken down into 8 indicators and weighted according to importance. Determining the TQI is a process of scoring these 8 indicators. Most of these indicators are widely agreed upon; however, color, clarity, and stone pattern have been a subject of dispute.
It may be hard to get an exact number because of the subjectiveness of these qualities. Also, the availability of turquoise tends to fluctuate respective the production levels of operating mines. This is only a guide to make evaluating the price of turquoise easier.
There is usually a slight deviation depending on the person scoring the TQI. For better accuracy please consult with a turquoise expert. Turquoise is a beautiful, hard, opaque, triclinic cryptocrystalline stone found in shades of green and blue.
Chemically, it is a hydrated aluminum copper phosphate. In an arid environment, turquoise forms inside the earth within host rocks such as limestone and sandstone under and high temperature and pressure, making it as hard as glass. The combination of different elements in the host rock material can change the appearance and structural integrity.
Some turquoise is not formed completely and needs the aid of enhancing agents to make it usable in jewelry. Physical structure makes up 55 points: Hardness 20 , Enhancement 20 , Composition 10 , and Cut 5. No two turquoise stones are alike. The fragments and impurities of the host stone that are not transformed into turquoise create a matrix of lovely unique colors and patterns. Synthetic plastic turquoise that has been dyed blue and machine molded can be mass-produced and has little value.
On the other hand, a calcium rich sea shell can form into turquoise if it happened to fossilize near a copper vein in the arid American southwest. While this is extremely rare, this can occur in just the right conditions. The rarities of this origin of turquoise, along with other rare quality indicators, bring tremendous value to our favorite blue stone.
Use the following charts as a guide to finding the TQI. Each indicator has a list of characteristics and a point value marked below. Hardness is a measurable quality that indicates how easy a material can be scratched. Naturally the harder the turquoise the more valuable it is. A Mohs scratch test can be performed to determine the exact hardness of a material; however doing so would damage the stone that you are trying to measure.
Simply use deductive reasoning. If the stone is solid then it is probably in the Mols pre determined the turquoise range between 3 and 6. For stones that are obviously lower quality use the chart below Brittle natural stones that are usually cloudy or stone that has been poorly stabilized receive 10 Stones that have been professionally stabilized are not allowed to receive more than 15 points even if they have a high hardness.
Natural stones that seem dull and feel chalky are most likely under 5 on the hardness scale and receive Rare high hardness natural stones may receive 20 points for hardness. If you cannot tell, then give it a A stone that has undergone treatment to improve its natural state is considered enhanced. Please enter your name here. You have entered an incorrect email address! Jamel Lasseter. Johnie Gladle. Emily Oneal.
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