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Rubies

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rubies

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Rubies Video

Glass filled, heat treated Rubies at The Bangkok Gem show Diese Adresse muss nicht mit der Rechnungsadresse übereinstimmen. Wenn die Lieferung nicht direkt an dich zugestellt werden kann, wird das Paket oftmals vom Paketdienstleister bei einem Nachbarn oder bei einer Paketstelle abgegeben. Diese Adresse muss nicht mit der Rechnungsadresse übereinstimmen. Andere Kunden kauften auch. Weitere Informationen auch zu Opt-out findest du unter Details ansehen. EUR 20,98 6 neue Artikel. Die roten Stücke sind mit einem schwarzen Netzmuster bedruckt und auf der Brust prangt eine schwarze Spinne. Du kannst den Anbieter also nur bewerten, wenn dieser eKomi Kunde ist und du z. Die jeweils gültige Umsatzsteuer ist in den Versandkosten enthalten. EUR 34,09 22 neue Artikel. Alle Ergebnisse für Rubies anzeigen. Schreibe uns eine Nachricht Das babymarkt.

Occasionally, such native stones are recut to custom proportions, albeit at a loss of weight and diameter. Custom cut and recut stones are usually more per carat.

Ruby is red corundum. The color comes from traces of chromium. All other color varieties of corundum are referred to as sapphire.

Depending on the chromium and iron content, rubies have a color range that includes pinkish, purplish, orangey, and brownish reds. The trace mineral content tends to vary with the location of the geologic formation which produced the ruby.

However, color is not always an indication of origin. There is an old joke about questionable stones: Most authorities expect a medium to medium dark-red color tone in a ruby.

Stones lighter than this are called pink sapphire. However, there is no general agreement on how to draw the line between rubies and sapphires.

Few other gems have as much myth, lore, and romance surrounding them as rubies. One of their chief attractions is the alleged protection from misfortune and bad health they were believed to afford their lucky owners.

While high-quality ruby is usually faceted for jewelry, ruby rough of lower quality is used in great quantities to make beads, carvings, and other ornamental objects.

Stones from Myanmar formerly Burma tend to have purplish red colors. Thai stones tend to appear more brownish red. Rubies fluoresce in long or short wave ultraviolet light.

Myanmar rubies often fluoresce so strongly that the effect is noticeable even in sunlight. They literally seem to glow and are greatly admired.

Thai stones generally lack this property. If this rutile is sufficiently abundant and precisely arranged, proper cabochon cutting can create star rubies.

Today there are heating and diffusion processes that can increase the rutile content and improve such gems. Inclusions can also help identify the source of a ruby.

See our article on identifying the origins of rubies and sapphires for more information. Corundum gemstones, both rubies and sapphires, were first synthesized in the early s by a simple flame fusion process.

More complex synthesis processes have been developed in recent years. These simulate natural formation conditions so closely that colors and even inclusions look extremely natural.

Such stones are difficult for all but the most highly skilled professionals to identify as synthetic. Rubies have a long history of enhancement.

Unless the seller specifically states the stone is unheated, you should assume that some kind of heat treatment has been used. Usually high temperature heating and controlled cooling is done to clarify the stones.

This process dissolves silk rutile inclusions and can also improve tone and saturation of color. Such treatments can only be detected in stones whose residual inclusions show signs of heat stress.

Truly clean stones will give no clues and cannot be verified as natural color. For more information on ruby enhancements, see Corundum Treatments.

Although Asia has historically been the major producer of ruby gems, there are many other sources including the United States, Australia, and most recently Africa.

Origin definitely affects the value of rubies. Stones from Myanmar generally command the highest prices. They also have extreme red fluorescence.

A mining tract in the Mogok region is the primary source of gem quality rubies. This fabled deposit has been known for over 1, years.

Usually, the rough stone is heated before cutting. These days, almost all rubies are treated in some form, with heat treatment being the most common practice.

Untreated rubies of high quality command a large premium. Some rubies show a three-point or six-point asterism or "star".

These rubies are cut into cabochons to display the effect properly. Asterisms are best visible with a single-light source and move across the stone as the light moves or the stone is rotated.

Such effects occur when light is reflected off the "silk" the structurally oriented rutile needle inclusions in a certain way.

This is one example where inclusions increase the value of a gemstone. Generally, gemstone-quality corundum in all shades of red, including pink, are called rubies.

Often, the distinction between ruby and pink sapphire is not clear and can be debated. That region has produced some exceptional rubies, however in recent years few good rubies have been found.

The most recently found ruby deposit in Myanmar is in Namya Namyazeik located in the northern state of Kachin. The Republic of Macedonia is the only country in mainland Europe to have naturally occurring rubies.

They can mainly be found around the city of Prilep. Macedonian rubies have a unique raspberry color. The ruby is also included on the Macedonian coat of arms.

Spinel , another red gemstone, is sometimes found along with rubies in the same gem gravel or marble. Red spinels may be mistaken for rubies by those lacking experience with gems.

However, the finest red spinels can have values approaching that of an average ruby. Rubies, as with other gemstones, are graded using criteria known as the four Cs, namely color, cut, clarity and carat weight.

Rubies are also evaluated on the basis of their geographic origin. In the evaluation of colored gemstones, color is the most important factor.

Color divides into three components: Hue refers to color as we normally use the term. Transparent gemstones occur in the pure spectral hues of red, orange, yellow, green, blue, violet.

Ruby is defined to be red. All other hues of the gem species corundum are called sapphire. Ruby may exhibit a range of secondary hues, including orange, purple, violet, and pink.

Improving the quality of gemstones by treating them is common practice. Some treatments are used in almost all cases and are therefore considered acceptable.

During the late s, a large supply of low-cost materials caused a sudden surge in supply of heat-treated rubies, leading to a downward pressure on ruby prices.

Improvements used include color alteration, improving transparency by dissolving rutile inclusions, healing of fractures cracks or even completely filling them.

The most common treatment is the application of heat. Most rubies at the lower end of the market are heat treated to improve color, remove purple tinge , blue patches, and silk.

The silk is partially broken, and the color is improved. Another treatment, which has become more frequent in recent years, is lead glass filling.

Filling the fractures inside the ruby with lead glass or a similar material dramatically improves the transparency of the stone, making previously unsuitable rubies fit for applications in jewelry.

If a color needs to be added, the glass powder can be "enhanced" with copper or other metal oxides as well as elements such as sodium, calcium, potassium etc.

The second heating process can be repeated three to four times, even applying different mixtures. The treatment can identified by noting bubbles in cavities and fractures using a 10x loupe.

In , Gaudin made the first synthetic rubies by fusing potash alum at a high temperature with a little chromium as a pigment.

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