A natural topaz of 18.95 carats, about 20.82 ratti, at Rs. 37,900 – Rs. 2,000 per carat. It is the largest stone in this category, where the smallest weighs 3.35 carats.

Why this is the one listing here called sky blue

Of the seventeen topaz stones in this category, this is the only one whose colour is recorded as "sky blue". The others record blue, light blue, white or grey. That record is why this listing carries the name and the others do not.

The photograph agrees: about 92% of its face reads as blue and 57% as a strong, saturated blue rather than a washed tint. Sky blue is the trade's name for the lighter, brighter end of treated blue topaz – not the deep "London blue" and not the pale, almost colourless end.

A large stone, honestly priced

At nearly nineteen carats this is a substantial gem, and at Rs. 2,000 per carat it sits at the bottom of our range, which runs to Rs. 4,179 per carat across the seventeen. That is not a discount and not a bargain signal; large blue topaz simply is not scarce. Five stones in this category share exactly that Rs. 2,000 rate, which is a flat figure rather than a stone-by-stone judgement, and we would rather say so.

At this size the practical question is the setting. Nineteen carats is a pendant, a statement ring or a cufflink; it will need a mount made for it rather than an off-the-shelf one.

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 blues you see in shops begin as colourless topaz, are irradiated to create a colour centre, then heated to stabilise it. The colour is permanent and does not fade in ordinary wear, and the practice is accepted everywhere in the trade.

It is not a defect. But it is the reason blue topaz is inexpensive, and a seller who lets you believe a strong 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 household dust. But it has perfect basal cleavage – a plane along which a sharp knock splits it cleanly, whatever its hardness. On a stone this large that matters: use a bezel, keep it away from ultrasonic cleaners and steam, and avoid sudden temperature change. Warm water, mild soap, 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 18.95 Carat. Its price is Rs. 37,900 — roughly Rs. 2,000 for each carat. Treatment: treatment not tested. Quote reference GS-000482 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 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.