Can I do a scratch test to confirm aquamarine?

No. A scratch test risks damaging the gem, its setting, or surrounding jewellery. Because aquamarine rates 7.5 to 8 on the Mohs scale, a proper scratch test is unnecessary and destructive. Use magnification and non-invasive inspection or seek a professional test instead.

How do professionals tell aquamarine from blue topaz or glass?

Gemmologists use instruments such as a refractometer, polariscope, spectroscope and specific gravity measurements to separate aquamarine from blue topaz, glass and synthetics. They also examine inclusion patterns and growth features that are visible under magnification.

Are all aquamarines treated?

Some aquamarines are heat-treated to reduce green tones or improve blue colour, which is a common and accepted practice. A professional lab report will note whether a stone shows evidence of treatment.

How to tell if an aquamarine is real

Clear, practical steps to check whether an aquamarine is real: what to look for by eye, simple safe tests you can try at home, and when to send the stone to a professional for testing.

Quick facts

Hardness: 7.5 to 8 on the Mohs scale
Gem type: the blue-green variety of beryl

What aquamarine is

Aquamarine is the blue-green variety of beryl and is valued for its clear, watery colour. It is a durable gem that rates 7.5 to 8 on the Mohs scale, which makes it harder than many common materials used in jewellery. Knowing this basic identity and hardness helps you choose appropriate inspections and avoid tests that could damage the stone or its setting.

Visual checks you can do first

Start with careful visual inspection under good light and a 10x loupe or magnifier. Look for: natural inclusions such as thin liquid veils, tiny crystals or feather-like fractures; consistent colour saturation rather than a uniform painted look; slight colour zoning along crystal growth directions; clean facet junctions and crisp facet edges. Glass and some synthetics often show rounded air bubbles, flow lines or an overly perfect surface. Check the setting and mount — genuine gemstones are often set in higher-quality metal and may be accompanied by a hallmark or stamp.

Simple non-destructive tests at home

Use a white background and direct light to view the stone from different angles; natural aquamarine may show subtle shifts in tone. Try a loupe to look for inclusions and bubbles. Hold the stone next to a known blue gem such as blue topaz or a piece of glass for a visual comparison of tone and brilliance. Do not attempt to scratch the stone or use household abrasives — because aquamarine is 7.5 to 8 on the Mohs scale, a scratch test can damage settings and other jewellery. Avoid putting the stone in household acids, ultrasonic cleaners or other harsh treatments without knowing whether it is natural or treated.

When to seek professional testing

If visual checks are inconclusive, take the stone to a qualified gemmologist or a reputable jewellery lab. Professionals use instruments such as refractometers, polariscope, spectroscope and specific gravity equipment to separate aquamarine from look-alikes like blue topaz, glass, dyed quartz or synthetic stones. They can also report on treatments or whether the stone is natural, lab-grown or filled. Ask for a written report if you need proof for insurance or resale.

Common imitations and how they differ

Common imitations include blue topaz, glass, dyed quartz and synthetic beryl. Glass often shows gas bubbles and flow lines when viewed under magnification. Dyed stones may display concentrated colour in fractures or along drilling holes. Synthetic stones can be very clean and lack the natural inclusions typical of mined aquamarine. Only gemmological testing can reliably distinguish between closely similar materials.

Using a photo-based check

If you want a quick, initial opinion from photos before visiting a professional, you can use an image-based identification tool. Such a service can point out obvious red flags from pictures but cannot replace instrumental testing for final verification. Jewelry Identifier can provide a fast photo review to help decide whether professional lab testing is needed.

Common questions

Can I do a scratch test to confirm aquamarine?: No. A scratch test risks damaging the gem, its setting, or surrounding jewellery. Because aquamarine rates 7.5 to 8 on the Mohs scale, a proper scratch test is unnecessary and destructive. Use magnification and non-invasive inspection or seek a professional test instead.
How do professionals tell aquamarine from blue topaz or glass?: Gemmologists use instruments such as a refractometer, polariscope, spectroscope and specific gravity measurements to separate aquamarine from blue topaz, glass and synthetics. They also examine inclusion patterns and growth features that are visible under magnification.
Are all aquamarines treated?: Some aquamarines are heat-treated to reduce green tones or improve blue colour, which is a common and accepted practice. A professional lab report will note whether a stone shows evidence of treatment.