A weight of 25.2 carats and a price of Rs. 9,450 give a per-carat figure of about Rs. 375. In aquamarine, that is a low rate for a stone of this size, so the first sensible question is what you are getting for it. What we can say is that it is a natural Afghan aquamarine (beruj), noted as sea blue, and the reference is GS-000287.

Stones in this family are frequently heated to clear a green cast. Whether that applies here is something to ask us on WhatsApp +92 308 887 3888; we will share what we know, and independent lab testing is available on request.

Choosing a setting

The Mohs hardness of 7.5 to 8 makes this stone workable as a ring, and the weight also suits a pendant. Inspect it under daylight and look through it at an angle; eye-visible inclusions are common in larger beryl and are worth noting when you compare stones. With Cash on Delivery you can open the parcel and examine it before paying. More are in the aquamarine category.

Cash on Delivery is available across Pakistan, so you inspect the stone before paying, and returns are accepted within 7 days of delivery. Before you choose, read our aquamarine guide.

This particular stone

This listing is one natural aquamarine, known in Urdu as Beruj, with a weight of 25.2 Carat. Its price is Rs. 9,450 — roughly Rs. 375 for each carat. Origin: Afghanistan. Treatment: treatment not tested. Quote reference GS-000287 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.

Above twelve carats you are into collector territory. Pieces this heavy are usually set as pendants or kept loose, and they are prized for the size of rough they came from. If you do set it, choose a bezel or a heavy claw to protect the edges.

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, a certificate is available on request, 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. Certificate available on request. 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.