"Premium quality" is the least useful phrase in the gemstone trade, because nobody has to define it. With blue topaz it is more awkward still, because the thing buyers usually grade a coloured stone on — its colour — is produced in a treatment plant rather than found in the ground, and it is therefore consistent across the whole market.

The stone

12.75 carats, which is 14.01 ratti. Rs. 25,500, Rs. 2,000 per carat, reference GS-BT-0010. Among our blue topaz photographs this is the second darkest, sitting at the London end of the scale.

Note that the rate is the same as every other blue topaz we list. We have not raised it to match the word on the label.

So what does separate one blue topaz from another?

1. The cut, and almost nothing else. Since colour is consistent, workmanship is where the real difference lies. Look for a bright, busy face rather than a flat one.
2. No window. Hold it over printed text and look straight down. If you can read through the middle of the table, the pavilion angles are wrong and light is escaping out of the back.
3. Crisp facet junctions. Facets should meet at sharp points. Rounded, smeared edges mean a rushed polish — and on a large transparent stone it shows.
4. Clarity. Topaz is usually eye-clean, so you should expect that rather than pay extra for it. Visible inclusions are a genuine fault here.
5. An even girdle. Consistent thickness all the way round, with no chips. On a stone with cleavage this is a durability question, not just a cosmetic one.

What we have not verified

Being straight about this is part of the same argument. Shape, measurements and a clarity grade are not recorded for this stone, and those fields stay blank rather than being filled with plausible values. The London grade is our reading from the photograph, not a laboratory finding — no routine report assigns these grades. Ask us on WhatsApp at +92 308 887 3888 and we will measure it, photograph it against a scale, or arrange independent laboratory testing.

The colour is treated, and that is the norm

Blue topaz gets its colour from irradiation and heating, starting from colourless topaz. It is standard for the stone, permanent, and stated on our specification sheet. There is no premium version of blue topaz that is naturally blue at this price.

Does premium mean certified?

No — separate claims. A certificate of authenticity is available on request and independent testing can be arranged, but no certificate grades a cut.

Durability

Topaz is 8 on the Mohs scale with perfect basal cleavage. Hard, but splittable under a sharp knock. No ultrasonic or steam cleaning; warm soapy water and a soft brush. See our topaz care guide.

Ordering

One piece only. 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. Compare it at full size against the rest of the blue topaz collection.

This particular stone

This listing is one natural blue topaz with a weight of 12.75 Carat. Its price is Rs. 25,500 — roughly Rs. 2,000 for each carat. Treatment: irradiated & heated. Quote reference GS-BT-0010 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.