Aquamarine
Blue in the Colours of the Sea
Aquamarine is a variety of beryl, the same mineral species as emerald. Its colours range from light blue to greenish blue, often with a delicate, transparent appearance. It suits those who enjoy colour that gives a piece of jewellery presence without dominating the design.
Gemological Properties
| Property | Aquamarine |
|---|---|
| Mineral | Beryl |
| Chemical composition | Be₃Al₂Si₆O₁₈ — beryllium aluminium silicate |
| Colours | Blue to greenish blue, usually light in tone |
| Hardness | 7.5–8 on the Mohs scale |
| Refractive index | 1.577–1.583 |
| Specific gravity | Approximately 2.72 |
| Birefringence | 0.005–0.009 |
| Optical phenomenon | Pleochroism: colour differences when viewed along different crystal directions |
These are reference properties for gemological identification, rather than a substitute for examining an individual stone.
Colour and Optics
Aquamarine can appear almost colourless in one crystal direction and more strongly blue in another. Cutting orientation therefore influences the colour seen in the finished gem. Thoughtful cutting brings out its transparency and light return.
Alongside faceted gems, aquamarine is fashioned into cabochons, beads and carvings. In unusual examples, parallel inclusions can produce a cat’s-eye effect.
Quality and Price
Colour is a major factor in aquamarine’s value. Generally, a stronger blue to slightly greenish blue is more highly valued than a pale colour. High transparency and the absence of eye-visible inclusions are desirable in faceted stones.
Cut quality and carat weight also affect price. Large aquamarines are available, so a larger gem does not necessarily cost more per carat than a smaller stone with exceptional colour.
The trade name Santa Maria describes aquamarine with a fine, deep blue colour. The name originated from a Brazilian deposit, but is now also used as a colour description and does not, by itself, establish geographical origin.
Treatments and Identification
Heat treatment is commonly used to reduce aquamarine’s greenish component and emphasise blue. The resulting colour change is considered stable. Fracture filling is occasionally encountered, although it is rare.
Some blue beryls owe their colour to irradiation, including Maxixe-type beryl. Unlike aquamarine’s characteristic blue, this colour can fade relatively quickly when exposed to strong light or heat. The rate depends on the stone and exposure conditions. Gemological examination is important for distinguishing these materials; an intense blue colour alone is insufficient.
Colour alone cannot establish identity. Gemological examination considers optical properties and internal characteristics to identify the material and distinguish natural gems from laboratory-grown material and imitations. Known treatments should be disclosed; their detectability depends on the treatment and the individual stone.
Suitability for Setting
Aquamarine is suitable for rings, earrings and pendants, including jewellery intended for daily wear. Setting choices should account for the stone’s condition, fractures and exposed corners. Its hardness provides useful scratch resistance, but does not make it immune to impact.
As a design choice, white metals emphasise its cool blue appearance, while yellow gold offers a warmer contrast.
Sources Around the World
Familiar aquamarine sources include Brazil, Pakistan, Madagascar and Mozambique. Colour-related trade names such as Santa Maria do not, by themselves, authenticate a stone's mining locality.
Spiritual and Symbolic Meaning — Beliefs and Traditions
In spiritual traditions, aquamarine is associated with the element of water, symbolising calm, introspection and an awareness of our emotional world. Its blue colour invites us to imagine a space in which we can pause, listen to ourselves and acknowledge feelings that may be difficult to express.
In chakra traditions, it is linked to the throat chakra and the symbolism of honest, clear communication: expressing what matters with courage and sensitivity, while remaining open to others. It is also associated with intuition, confidence in self-expression and balance between thought and emotion.
Its symbolic connection to water and femininity can represent creativity, receptiveness and a connection to life — meanings that anyone can interpret personally, regardless of gender.
These meanings belong to the realm of belief and symbolism. They can give jewellery personal significance, but they are not proven gemological properties or a promise of healing, protection or a change in health.
Aquamarine at TzurGems
At TzurGems, we bring knowledge of gemstones together with thoughtful jewellery making: Guy, gemologist, and Rafael, artisan goldsmith. Choosing an aquamarine begins with its colour and character, followed by a setting that gives both room to shine.