Aquamarine, derived from the Latin phrase "aqua marina," quite literally translates to "water of the sea." It's no surprise, then, that this stunning gemstone shares a striking resemblance to the serene blues and greens found in the ocean depths.
But what exactly is the color of aquamarine? Is it a blue or a green? Let's dive into the fascinating world of this precious stone to uncover the complexity of its color.
Understanding Aquamarine's Composition
Aquamarine is a type of beryl, a mineral composed of beryllium aluminum silicate. What gives aquamarine its unique color is the trace amounts of iron within its crystal structure.
The amount and variety of iron present determine the exact hue of an aquamarine gemstone. It's this iron content that makes aquamarine such a fascinating gem, as it can exhibit a wide range of colors, from pale blue to deep green.
Blue Aquamarine: The More Common Hue
Blue aquamarines are the more common variety, and their color can range from pale azure to a vibrant, jewel-toned blue. This wide spectrum of blue hues is achieved by varying the amount of iron within the crystal. The deeper the blue, the more iron the crystal contains.
Fun fact: The most valuable blue aquamarines are those that exhibit a pure, vibrant blue with no hint of green. These are often labeled as "Santa Maria" aquamarines, after the Brazilian mines where they were first discovered.
Green Aquamarine: A Less Common but Beautiful Variety
Green aquamarines, while less common, are no less stunning. These gemstones exhibit a range of green hues, from pale to deep forest green. The color is dictated by the specific type of iron present in the crystal, as well as the crystal's structure.
Notably, green aquamarines can sometimes undergo a natural phenomenon called "photochromism." When exposed to sunlight, these gems can temporarily change color, appearing more blue. However, this is not a permanent shift and will return to their original green hue when removed from sunlight.
The Color Zoning of Aquamarine
One of the unique features of aquamarine is its tendency to exhibit color zoning. Color zoning refers to the phenomenon where a single crystal contains distinct zones of different colors. This is most commonly seen in aquamarine, with various shades of blue or green present within a single stone.
Color zoning can create beautiful, captivating gems. It can also make grading and valuing aquamarines more complex, as assessors must consider the average color, as well as the range of colors present in the stone.
Color Zoning in Blue Aquamarines
In blue aquamarines, color zoning often manifests as concentric circles of varying blue hues. This is due to the differing amounts of iron present at different points in the crystal's growth. The result can be a stunning spectrum of blues, reminiscent of the ocean's depths.
Such zonings can add to the gemstone's beauty, especially when they result in a mesmerizing play of color. However, in some instances, color zoning can detract from a gem's value, particularly if it includes zones of paler blue or green, which can be less desirable.
Color Zoning in Green Aquamarines
Green aquamarines can also exhibit color zoning, but it's less common than in blue aquamarines. When present, the zoning often results in concentric circles of different green hues, much like in blue aquamarines.
In some cases, green aquamarines can exhibit a phenomenon known as "pleochroism." This means the gemstone exhibits different colors when viewed from different directions. In the case of green aquamarines, this can result in a stunning display of green, blue, and even clear zones within a single gem.
From the stunning blues of the ocean to the lush greens of the forest, aquamarine dazzles with its multitude of colors. Whether you're captivated by the vibrant blues or the earthy greens, there's no denying that aquamarine is a gemstone of unparalleled beauty and complexity.
In the world of aquamarine, as in the ocean depths it so closely mirrors, there's always more to discover. Whether you're a gemstone connoisseur or simply captivated by the beauty of aquamarine, there's always more to learn and admire in this fascinating realm of color.