Brilliant Cut Trillion Aquamarine
Named after the Latin aqua (water) and mare (marine or the sea), the clear-blue sea-water color of aquamarine is a popular gemstone. Most natural-color aquamarine is light bluish-green similar to a sea green. This was the preferred color of Aquamarine in the 19th century. Today, Aquamarine is routinely heat-treated to remove the green component, changing it to the more valued colors of sky blue and dark blue.
The more intense the blue color, the more valuable the stone. Aquamarines usually have a high transparency and clarity, even under magnification and is dichroic, appearing blue or colorless as the stone is viewed from different angles. They are also very durable gemstones and their color is evenly distributed throughout the stone. Gem-quality Aquamarine is found as hexagonal crystals, which may be up to 39 inches (1 meter) long and flawless, with striations along the length of the crystal. Fine quality stones over a carat can retail for $200-$1000 per carat, and is cut with the table facet parallel to the length of the crystal in order to emphasize the deepest coloration. Almost all Aquamarine on the market has been heat treated to enhance its color by removing tinges of yellow and brown caused by iron. The color change is permanent and is an acceptable practice by those in the jewelry trade. If overheated, the stones may become colorless.
 Excellent Valuable 717Cts Natural Blue Aquamarine Loose Gemstone Lot 9 Pcs  US $71.10
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 Natural Aquamarine 50 Ct 638 x 497 MM Oval Faceted Loose Gemstone 11121413 US $8.46
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 Natural Aquamarine 65 Ct 682 x 484 MM Oval Faceted Loose Gemstone 11121419 US $25.50
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 Natural Aquamarine 70 Ct 727 x 532 MM Oval Faceted Loose Gemstone 11121412 US $12.71
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 Natural Aquamarine 95 Ct 708 x 534 MM Oval Faceted Loose Gemstone 11121418 US $25.50
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 Natural Aquamarine 95 Ct 717 x 509 MM Oval Faceted Loose Gemstone 11121415 US $12.71
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 Natural Aquamarine 070 Ct 688 x 481 MM Faceted Oval Loose Gemstone 11121406 US $25.50
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 Natural Aquamarine 080 Ct 710 x 499 MM Faceted Oval Loose Gemstone 11121405 US $12.71
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 Natural Aquamarine 14 Ct 794 x 654 MM Faceted Cushion Loose Gemstone 11121409 US $21.21
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 Natural Aquamarine 165 Ct 82 x 716 MM Octagon Faceted Loose Gemstone 11121417 US $21.21
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Aquamarine…
Today, Aquamarine is routinely heat-treated to remove the green component, changing it to the more valued colors of sky blue and dark blue….