Named after the color of sea water, aquamarine is the blue to blue-green member of the beryl family. Readily available and moderately priced, the modern March birthstone makes an excellent jewelry stone. Since aquamarines are available in large sizes, there's no incremental increase in value per carat for large gems.
A ct aquamarine will be worth the same price per carat as a single carat gem of equal quality. The gem price is dependent on claritydepth of color, and to a lesser extent the purity of color. For more detailed information on aquamarine quality factors, consult our "80 carat aquamarine" buying guide.
See the entire Gem Price Guide. This beautiful gem receives its coloring from trace amounts of ferrous iron. When you do, the color is usually enhanced by the cut. Its mystical "80 carat aquamarine" traditionally includes protection for sailors and fishermen as well as travelers in general.
Deep designs, like Barions and emerald cutsare usually preferred.
Low crown will produce higher brilliance, but higher crowns are often used to deepen the color. The beryl family, including aquamarines, are some of the easiest gems to polish. Diamond polish is the most common method. A high-quality polish can give light aquamarines such great brilliance they might be confused with higher refractive index RI gems.
Even with a moderate dispersion of 0. This makes for an outstanding gemstone. Three-piece aquamarine rough and cut set. Inclusions are interesting features of this gemstone. Beryl, and aquamarine in particular, are known for having long, hollow tubes. This distinctive feature will identify a gem as a member of the beryl family. They may also contain crystals of apatitecassiteriteepidotegarnetmuscovite; quartzand tourmaline.
With enough hollow tube inclusions and proper cutting, aquamarines can show chatoyancy and even asterism.
Their prices come very close to that of clean, faceted gems with the same coloring. Aquamarines can be synthesized. Only professional gem labs can distinguish natural from created aquamarines. Most aquamarines come out of the ground with a greenish tint.
In the past, this was done routinely. Nowadays, a more sophisticated public has started appreciating slightly green, untreated aquamarines. However, distinguishing this heating process proves impossible. In the s, Maxixe pronounced mah-SHE-shea very dark blue aquamarine, appeared on 80 carat aquamarine market.
You can distinguish the Maxixe from a natural aquamarine by its lack of pleochroism. Natural aquamarines have distinct blue and colorless dichroism.
On the other hand, the Maxixe has no pleochroism. When viewed from any angle, it just shows blue.
The absorption spectrum of natural aquamarine and the Maxixe also differs. You can also distinguish a Maxixe aquamarine from a natural stone with a dichroscope.
Both windows remain blue when viewing a Maxixe. In contrast, one window should be colorless or pale yellowish when viewing an untreated specimen. Lapidaries have cut gems that weigh several hundred carats, 80 carat aquamarine too large to be worn. Beryl crystals weighing many tons have been found in pegmatites, but these are never of gem quality. However, aquamarines may be very large and still be gem quality.
A blue-green crystal was found in Marambia, Teofilo Otoni, Brazil. This irregular prism, transparent end to end, measured 19 inches long and 16 inches across and weighed almost pounds.
The famous Martha Rocha aquamarine, found in Brazil, weighed pounds and yielded more thancarats of superb blue gems. An even larger crystal found in weighed pounds but yielded onlycarats of cut gems.
80 carat aquamarine terms may only refer to the color.
Aquamarines require no special care. They can resist the rigors of everyday wear very well. However, inclusions within aquamarines may not react well to mechanical cleaning techniques like ultrasound or steam, increasing the 80 carat aquamarine of shattering.
Consult with a gemologist first to determine if your gems can withstand these cleaning methods. Consult our gemstone jewelry care guide for more recommendations.
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Aquamarine Value Since aquamarines are "80 carat aquamarine" in large sizes, there's no incremental increase in value per carat for large gems. This unusual arrangement brings together princess-cut aquamarines, marquise sapphires, and seed pearls to create a one-of-a-kind ring. Aquamarine Value via Gem Price Guide. See Plans and Pricing. Weak band may be seen at Occurrence Granitic rocks, especially granite pegmatites. See "Identifying Characteristics" below.
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