There are a few good ways to set a 12.45 carat blue topaz. A closed-back silver ring gives a bold look and shields the stone, while a pendant lets the size speak without exposing it to knocks. Gold works as well, though a stone of this weight adds real heft to a ring, so decide first how often it will actually be worn.

Topaz has a hardness of 8 on the Mohs scale, enough for a ring, but it can split along its cleavage if struck on an edge. If you would like help with a custom silver ring, message us on WhatsApp quoting AG-BL-0008 and we will talk it through.

About the stone

It weighs 12.45 carats and has the lowest per-carat rate among this group of blue topaz, which makes it a lot of stone for the money. The blue comes from irradiation and heating, the usual route for this gem, and the colour holds in sun and heat. We are happy to tell you what we know about this exact piece.

Other weights are in the blue topaz category.

No payment is taken until you have opened the parcel and seen the stone for yourself. Karachi orders typically arrive within 1 to 2 working days, Lahore, Islamabad and other cities within 2 to 4, and returns are open for 7 days. Before you choose, read our blue topaz guide.

This particular stone

This listing is one natural blue topaz with a weight of 12.45 Carat. Its price is Rs. 11,100 — roughly Rs. 892 for each carat. Treatment: treatment not tested. Quote reference AG-BL-0008 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 blue topaz rates 8. Few materials will scratch it, so it copes well with everyday ring wear. A soak in warm water with a drop of mild soap and a soft brush keeps it bright; skip the ultrasonic cleaner if inclusions reach the surface.

Whoever you buy blue topaz 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 blue topaz 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): Blue topaz gets its blue colour from irradiation and heating — this is standard for the stone and the colour is stable. 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.