Blue topaz is one of the easiest gemstones to price honestly, and the reason is unusual: the thing that normally drives a coloured stone's value — scarcity of good colour — does not apply, because the colour is produced rather than found. What is left is weight and workmanship.

This stone's numbers

12.45 carats, which is 13.68 ratti. Rs. 24,900, Rs. 2,000 per carat, reference GS-BT-0008.

Why our rate is flat

Look across our blue topaz listings and you will find Rs. 2,000 per carat on every one, from 8.85 carats to 19.10, and across all three colour grades. That consistency is deliberate and it reflects how the stone actually works:

• Topaz is abundant. Colourless topaz, the starting material, is common and inexpensive.
• The colour is manufactured. Irradiation and heating turn colourless topaz blue. The process is industrial, repeatable and not scarce.
• Size carries no premium. Large clean topaz is not rare, so the per-carat rate does not climb with weight the way it does for sapphire.
• Grade carries no premium either. Sky, Swiss and London are different treatment outcomes, not different levels of rarity.

So what should you pay?

For faceted blue topaz of decent cut, roughly Rs. 1,500 to Rs. 3,000 per carat is the honest range in Pakistan. Well above that needs a reason — exceptional cutting, a documented laboratory report, or a size that genuinely is unusual. Well below it, ask whether you are being offered glass or synthetic spinel, both of which are sold as blue topaz in local markets. Our blue topaz price guide works through it, and the general price guide covers the other stones.

How do I know it is topaz and not glass?

Topaz is noticeably heavier for its size than glass or quartz — the density difference is something you can feel. Glass shows round gas bubbles and swirl lines under a loupe. And topaz is 8 on the Mohs scale, so it does not pick up the surface scratches that an old glass imitation always carries. Our real versus fake gemstones guide covers the checks, and independent laboratory testing can be arranged.

The treatment, stated plainly

Blue topaz gets its colour from irradiation and heating — standard for the stone, permanent, and on our specification sheet rather than hidden. Material is held until residual activity has decayed to safe levels before release, which is a regulated requirement.

Durability

Topaz is 8 on the Mohs scale but has perfect basal cleavage, so it can split under a sharp knock even though it rarely scratches. No ultrasonic or steam cleaners. Warm soapy water and a soft brush. Our care guide has the routine.

Ordering

One piece only. Shape and measurements have not been recorded; we will measure it on request — WhatsApp +92 308 887 3888. Flat Rs. 500 delivery anywhere in Pakistan, insured and tracked, dispatched in one to two working days. Cash on Delivery, seven days to return it unused.

This particular stone

This listing is one natural blue topaz with a weight of 12.45 Carat. Its price is Rs. 24,900 — roughly Rs. 2,000 for each carat. Treatment: irradiated & heated. Quote reference GS-BT-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, 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: Irradiated & heated. Certificate available on request. 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.