A natural topaz of 3.80 carats, about 4.18 ratti, at Rs. 8,630 – roughly Rs. 2,271 per carat. That is the joint lowest total price in this category. Its colour is recorded as light blue.

The brightest stone here

Measured across the photograph this is the lightest of the seventeen, with an average brightness of about 196 on a 0-255 scale against 156 for the deepest stone in the category. About 76% of its face reads as blue, but only 23% as a strong saturated blue, with roughly 21% near-colourless.

In plain terms: a pale, bright, airy stone rather than a deep one. If you want depth of colour, another stone in this category gives you noticeably more, and the prices are not far apart. If you want something light that catches a lot of daylight, this is it.

Shape

A rounded rectangle, about 1.59 times as long as it is wide, brilliant-faceted, its outline filling about 75% of its bounding box.

Where the blue comes from

Almost all blue topaz is irradiated and then heated. Natural blue topaz is rare and faint; the blues on the market begin as colourless topaz, are irradiated to create the colour and heated to stabilise it. The result is permanent, and the practice is accepted everywhere in the trade. For this stone the treatment has not been tested and there is no laboratory report.

Mohs 8, and the cleavage

Topaz is 8 on the Mohs scale, harder than quartz, and it still has perfect basal cleavage – a plane along which a sharp knock splits it cleanly whatever its hardness. Use a bezel for ring wear, keep it away from 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 3.8 Carat. Its price is Rs. 8,630 — roughly Rs. 2,271 for each carat. Treatment: treatment not tested. Quote reference GS-000496 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.