Aquamarine: Properties, Treatments & Care

Aquamarine

Aquamarine is the green-blue to blue variety of beryl. It shares its mineral species with emerald, but its colour range and variety name are different. A pleasing blue appearance does not establish that an individual stone is untreated.

AI-assisted source review · 2026-10-16. No named gemologist review is claimed. How this reference was reviewed.

Identification and properties
Mineral species	Beryl
Mohs hardness	7.5–8
Refractive index (reference range)	1.577–1.583
Birefringence (reference range)	0.005–0.009
Specific gravity (reference value)	Approximately 2.72
Chemical composition	Be₃Al₂Si₆O₁₈

Identification and properties

Mineral species

Beryl

Mohs hardness

7.5–8

Refractive index (reference range)

1.577–1.583

Birefringence (reference range)

0.005–0.009

Specific gravity (reference value)

Approximately 2.72

Chemical composition

Be₃Al₂Si₆O₁₈

Classification and appearance

GIA describes aquamarine’s colour as commonly light and pastel. Heating can give it a bluer appearance. Ask how the stone has been described and what treatment information accompanies it; a photograph alone cannot resolve that history.

For a practical comparison, request images under consistent conditions and consider the face-up dimensions alongside weight. Keep descriptive preferences separate from identification. A colour that you like is a selection preference, while natural origin and treatment are questions that require supporting evidence.

Treatments and disclosure

Treatment information should accompany the individual stone. GIA notes that aquamarine is rarely fracture filled and identifies additional cleaning concerns where fractures or liquid inclusions are present. Ask whether any such condition has been recorded rather than assuming that all aquamarines have the same care profile.

Identification and documentation

A name on a label is a starting point, not a laboratory conclusion. Ask whether the material has been identified as natural or laboratory grown, which treatments were detected, and which questions the examination actually addressed. Read the report for the individual stone rather than borrowing a conclusion from a similar-looking example.

Keep the report number, stone measurements and seller description together when discussing a purchase. If any of those details disagree, pause and ask for clarification. A reference photograph on this website is an educational example; it cannot establish the identity, treatment or geographic origin of a stone in another listing.

Care and cleaning

Aquamarine rates 7.5 to 8 on the Mohs scale. Protect it from scratching and knocks. GIA recommends warm soapy water as a safe general cleaning method and advises against heat exposure. Ultrasonic or steam cleaning should not be selected without considering fractures, inclusions and any disclosed treatment.

Questions to ask before choosing a stone

Request clear photographs under more than one lighting condition and ask which image best represents the stone in ordinary use. Compare dimensions as well as weight, and ask about any treatment-related care requirements before deciding on a setting. These questions are useful even when the gemstone name is familiar.

Do not infer the terms of a sale from this educational article. Availability, a particular report, delivery and return conditions belong to the individual seller and purchase channel. Keep written answers with the relevant listing information so that your decision is based on the stone being offered.

Reading the property table

The optical and density values here are reference ranges from GIA, not measurements of a pictured specimen. A property table helps you understand the material being discussed; it is not a substitute for a laboratory examination. Results depend on the sample, instrument and method, and more than one observation may be needed to distinguish natural, synthetic and treated material. Ask for the conclusions of the examination rather than attempting to identify an unknown stone from one number.