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SMOKY QUARTZ is mainly found in quartz veins and pegmatite dikes that cut across igneous and metamorphic rocks. It ranges from a light yellowish brown to a brown that is so dark that it appears...
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TURQUOISE is found in only a few places on earth, dry and barren regions where acidic, copper-rich groundwater seeps downward and reacts with minerals that contain phosphorus and aluminum. The result of this sedimentary process...
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TOURMALINE colors have many different causes. Traces of iron, and possibly titanium, induce green and blue colors. Manganese produces reds and pinks, and possibly yellows. Some pink and yellow tourmalines might owe their hues to...
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TOPAZ has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. The gem can show different colors in different crystal directions. Brazil...
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SAPPHIRE come in violet, green, yellow, orange, pink, purple, and intermediate hues. Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent...
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RUBY a pink to blood-red colored gemstone, a variety of the mineral corundum. Rubies can command the highest per-carat price of any colored stone. This makes ruby one of the most important gems in the...
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PERIDOT most of the peridot seen in jewelry today comes from sources such as China, Myanmar, Pakistan, Tanzania, Vietnam and the United States, some journeyed to Earth on meteorites while others are found in exotic...
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PEARLS natural and cultured pearls occur in wide variety of colors. The most familiar are white and cream, but the palette of colors extends to every hue. The most valuable pearls occur spontaneously in the...
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OPAL may be transparent, translucent, or opaque and the background color may be white, black, or nearly any color of the visual spectrum. Black opal is the rarest, whereas white, gray, and green are the...
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ONYX gemstone found in various regions of the world including Yemen, Uruguay, Argentina, Australia, Brazil, Canada, China, Czech Republic, Germany, India, Indonesia, Madagascar, Latin America, the UK, and various states in the US. Black Onyx...
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GARNET Red garnet is one of the most common and widespread of gems, found in rocks altered by heat and pressure. Garnet is the birthstone for January and the gem for the second anniversary.
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EMERALD is the green to greenish blue variety of beryl, a mineral species that also includes aquamarine as well as beryl in other colors. The principal Emerald deposits are currently mined in Colombia, Brazil, and...
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DIAMOND is a unique member of the mineral kingdom. The only gem made of a single element: It is typically about 99.95 percent carbon. Diamonds crystal structure is isometric, which means the carbon atoms are...
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CITRINE is rare in nature. In the days before modern gemology, its tawny color caused it to be confused with topaz. Today, its attractive color, plus the durability and affordability it shares with most other...
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AQUAMARINE name comes from the Latin word for seawater and it was said to calm waves and keep sailors safe at sea. This gemstone was thought to enhance the happiness of marriages. The best gems...