A natural topaz of 5.85 carats, about 6.43 ratti, at Rs. 14,250 – roughly Rs. 2,436 per carat. Its colour is recorded as blue.

The most evenly blue stone in this category

Measured across the photograph, about 95% of this stone's face reads as blue – the highest share of the seventeen stones here, where the palest reads barely 1%. Roughly 67% reads as a strong, saturated blue rather than a washed tint, and only about 3% is near-colourless. In plain terms: very little of this stone is doing anything other than being blue.

A square cushion

It is the most balanced outline in this category, measuring 1.00 times as long as it is wide – a square cushion, not a round brilliant. That distinction matters because one of the names we were given for this category was "Round Cut White Topaz Stone", and it was refused: a square cushion is not round, and this stone is not white. Its outline fills about 81% of its bounding box, and it is brilliant-faceted.

Where blue topaz comes from

Almost all blue topaz is irradiated and then heated. Natural blue topaz exists but is rare and very faint. The strong blues sold everywhere begin as colourless topaz, are irradiated to create a colour centre, and are then heated to stabilise it. The colour is permanent, does not fade in ordinary wear, and the practice is accepted throughout the trade.

It is not a defect and it is not hidden. It is, however, the reason blue topaz is inexpensive, and anyone implying that a deep blue topaz came out of the ground that colour is misleading you. For this stone the treatment has not been tested and there is no laboratory report; the honest expectation is the usual one.

Mohs 8, and the cleavage

Topaz is 8 on the Mohs scale, harder than quartz and harder than ordinary dust, so it keeps its polish well. But it has perfect basal cleavage: a plane across the crystal along which a sharp knock splits it cleanly, whatever its hardness. Set it in a bezel for ring wear, keep it out of ultrasonic cleaners and steam, and avoid sudden temperature change. Warm water, mild soap and a soft brush.

Ordering

One stone, sold once. Message us on WhatsApp for more photographs or a video, and we deliver across Pakistan.

This particular stone

This listing is one natural topaz, known in Urdu as Sunehla, with a weight of 5.85 Carat. Its price is Rs. 14,250 — roughly Rs. 2,436 for each carat. Treatment: treatment not tested. Quote reference GS-000485 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.

Between two and six carats is the range most people choose for a gents' ring or a noticeable pendant. Here colour drives the price more than size does, which is why two stones of near-identical weight can be priced very differently.

On the Mohs scale 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 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 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: Treatment not tested. Certificate available on request. As general background (not a statement about this stone): Yellow and golden topaz is usually untreated, though some colours are produced by heating. 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.