At 7.5 to 8 on the Mohs scale, aquamarine sits well above quartz and ranks among the sturdier coloured stones for a ring. That counts with this 6.12 carat cushion cut, because a stone of this size stands proud on the hand and will meet the odd door frame.

Hard is not the same as tough, though. Aquamarine can chip at sharp corners if it is struck, so pick a setting that guards the edges, such as a bezel or a prong at each corner. As a pendant, the risk is lower still.

It is a natural aquamarine, beruj in Urdu, sea blue and cut as a cushion. Aquamarine is often heated to give a cleaner blue; message us on WhatsApp quoting AG-000263 and we will tell you what we know about this stone. An independent lab test is your choice.

Cleaning and storage

Warm water, a drop of mild soap and a soft brush are all it needs. Store it away from harder stones. Similar pieces are in the aquamarine category.

You see the stone before paying with Cash on Delivery; Karachi usually takes 1–2 working days, other cities 2–4, and returns run for 7 days. Read our aquamarine guide.

This particular stone

This listing is one natural aquamarine, known in Urdu as Beruj, with a weight of 6.12 Carat. Its price is Rs. 6,000 — roughly Rs. 980 for each carat. Treatment: treatment not tested. Quote reference AG-000263 when you message us about it. The photographs show this exact stone, so what arrives at your door is the piece you chose on screen.

From six carats up a stone becomes the centre of attention. It wants a broader shank or a secure claw setting and suits an occasion ring, a signet or a centre pendant. Clean natural material of this size turns up far less often, and the per-carat rate reflects that.

On the Mohs scale aquamarine rates 7.5 to 8. It handles daily wear, but a hard knock can still nick an exposed corner, so a protective setting is a sensible choice. Clean it with warm soapy water and a soft brush, and keep it away from abrasive cleaners and high heat.

Whoever you buy aquamarine from, make sure of three things: the stone is natural rather than lab-grown, glass or glass-filled; any treatment is stated in writing; and the weight quoted is the weight of the finished stone. We check every aquamarine for those three points before it is listed, and because you pay on delivery you can look at the stone — or have it tested — before any money changes hands.

We sell natural stones only and inspect each one before it is listed. Treatment for this stone: Treatment not tested. No lab report yet; independent testing welcome. As general background (not a statement about this stone): Aquamarine is commonly heated to remove green tones and leave a purer blue. Ask us on WhatsApp and we will tell you what we know about this exact stone; independent lab testing is available on request.

A certificate of authenticity is available on request for this stone, and independent laboratory testing can be arranged. Because you pay on delivery, you can also take the stone to a lab of your choice within the 7-day return window. Read more on our authenticity page.