Introduction

Aquamarine’s name comes from the Latin for seawater and it was said to calm waves and keep sailors safe at sea. March’s birthstone was also thought to enhance the happiness of marriages. The best gems combine high clarity with limpid transparency and blue to slightly greenish blue hues. Like many beryl, aquamarine forms large crystals suitable for sizable fashioned gems and carvings.

Description 

Aquamarine is the green-blue to blue variety of the mineral beryl. (Emerald is the green to bluish green variety of the same mineral.) Its color is usually a light pastel greenish blue. Heat treatment usually gives it a more bluish appearance.
Aquamarine crystals are known to be large in size and relatively clean and well-formed, making them particularly valuable to collectors of mineral specimens.

Facts

• Mineral: beryl
  
• Chemistry: Be₃Al₂Si₆O₁₈
  
• Color: greenish blue, light in tone
  
• Refractive index: 1.577 to 1.583
  
• Birefringence: 0.005 to 0.009
  
• Specific gravity: 2.72
  
• Mohs Hardness: 7.5 to 8.0

Aquamarine Birthstone Meaning & History

Aquamarine’s name comes from the Latin for seawater, and ancient mariners claimed the gem would calm waves and keep sailors safe at sea. This March birthstone was also thought to bring happiness in marriage. Beryl was believed to give the wearer protection against foes in battle and litigation. It was also thought to make the wearer unconquerable and amiable, and to quicken the intellect.
 

Aquamarine is not only the birthstone for March, but the gem is also given as a present on the 19th wedding anniversary. As for famous ones, in 1936 the government of Brazil gave First Lady Eleanor Roosevelt a dark blue rectangular step cut aquamarine that weighed 1,298 carats (ct). It was the larger of two stones faceted from a piece of aquamarine rough that itself weighed an impressive 2.9 pounds (1.3 kilograms). It is now housed at the Franklin D. Roosevelt Presidential Library and Museum in Hyde Park, New York. A celebrated attraction at the Smithsonian Institution is the 10,363 ct (about 4.6 pounds) Dom Pedro Aquamarine – believed to be the largest faceted aquamarine in the world. The approximately 14 inch (36 centimeter) high obelisk was fashioned by acclaimed German lapidary Berndt Munsteiner using the fantasy cut technique.

Where is Aquamarine Found?

The Brazilian state of Minas Gerais has been an important source of aquamarine for the past two centuries. Travel there and you’ll find a changing panorama of landscapes: rocky hills, rivers and scrub brush dominate the central and eastern regions; savannahs, forests and streams checker the west; and lush green hills roll southward. Aquamarines are found in primary (hard rock) and secondary (weathered) pegmatite deposits in the eastern portion of the state, near the gem center of Teófilo Otoni.
 
Aquamarine is also found high in the Karakorum foothills of Pakistan. To reach the deposits, miners must climb steep paths to elevations of 9,800 to 13,000+ feet (3,000 to more than 4,000 meters) and work the sides of forbidding cliffs. Below this inhospitable rocky world lie fertile valleys, rushing rivers and small towns. Aquamarine from this area has been described as “water clear.”

Aquamarine birthstones are also mined in Kenya, Madagascar, Nigeria, Zambia and Mozambique, as well as elsewhere in Africa. U.S. sources include the Mount Antero area of Colorado (it’s the state gem) and California’s Riverside and San Diego counties. In addition, aquamarine has been found in China, Myanmar, Russia and Ukraine, among other countries.

Aquamarine Birthstone Care & Cleaning

With a hardness of 7.5–8 on the Mohs scale, this March birthstone is durable enough for everyday wear. Caring for the gem is easy. Ultrasonic cleaners and steam cleaning are usually safe options as long as there are no fractures or liquid inclusions in the gem.

Product Information

Aquamarine Quality Factors

In the commercial market, aquamarine competes with treated blue topaz for attention, but fine aquamarine sells for far more than equivalent-quality treated blue topaz.

Color
Aquamarine’s color range is very narrow: It can be blue, very slightly greenish blue, greenish blue, very strongly greenish blue, or green-blue. The gem’s most valuable color is a dark blue to slightly greenish blue with moderately strong intensity. In general, the purer and more intense the blue color, the more valuable the stone. Most aquamarine is a light greenish blue.

Although some buyers prefer the more greenish natural color, most of the aquamarine in the market was heat-treated to give it more of a pure blue.
Fashioned aquamarines often have to be fairly large—generally over 5 carats—to show intense, dark color. Although small gems are rarely saturated enough to be attractive, stones from some mines in Africa—Nigeria, Madagascar, and Mozambique, for example—are known for intense color in sizes under 5 carats. For this reason, smaller, top-color stones might sell for more per carat than larger stones of the same color.

Clarity
Most faceted aquamarines are eye-clean. Some crystals might contain liquid inclusions, but clarity characteristics are few or absent in most finished gems. Stones with eye-visible inclusions are usually fashioned into cabochons, beads, or carvings.

In some beryl crystals, there are enough parallel inclusions—usually long hollow or liquid-filled tubes—to allow cutters to fashion the rough to show a cat’s-eye.

Cut
Aquamarines can be cut into almost any shape, but cutters often fashion them as emerald cuts or as round or oval brilliants. The rough is fairly plentiful, so well-cut stones are fairly common. The gemstone’s hardness and transparency make it popular with designers, artists, and carvers. Gem sculptors use aquamarine for fantasy cuts and ornamental objects.The gem is pleochroic, which means it shows different colors in different crystal directions—in the case of aquamarine, they’re near-colorless and strong blue. Fortunately, the blue pleochroic color corresponds with the cutting orientation that retains the most weight, with the table facet aligned parallel to the length of the crystal.

Carat Weight
Aquamarine crystals come in sizes from very small to very large—some even up to 100 lbs. (45 kg). While large stones are readily available, it’s difficult to use them in jewelry, so there’s less demand for them, except as center stones. As a result, per-carat prices tend to decrease for sizes above 25 carats.
Many very large aquamarine crystals have been discovered. The largest Brazilian aquamarine on record was found in 1910, in Minas Gerais, Brazil. It weighed 244 lbs. (110 kg) and measured 19 in. (48 cm) long and 15 in. (38 cm) in diameter.