A natural tanzanite of 6.10 carats, about 6.70 ratti, at Rs. 12,380 – roughly Rs. 2,030 per carat. Its colour is recorded as Blue.

What "blue tanzanite" means, and what we can stand behind

Tanzanite runs from a pure sapphire-like blue through blue-violet to a distinctly violet purple. This stone's colour is recorded on our system as Blue, and that is the basis for the name on this listing.

What we are not doing is describing the shade from the picture. The image above is a catalogue photograph shared across all nine tanzanite listings here – we compared the nine files and they are one photograph, several of them mirrored. It is not a photograph of this stone. Ask us and we will send photographs and a video of the actual stone.

Pleochroism, which is the interesting part

Tanzanite is strongly pleochroic: it shows different colours down different crystal directions – typically blue one way, violet another, and a brownish or burgundy tone down the third. A cutter decides, when orienting the rough, how much blue and how much violet the finished stone will show, and that decision costs weight. Orienting for the best blue usually means throwing more of the crystal away, which is part of why strongly blue tanzanite is dearer.

It also means the stone will not look identical under a shop light and daylight, or from every angle. That is the gem behaving normally, not a fault.

Treatment

Rough tanzanite is usually brown. Almost all tanzanite is heated to produce the blue-violet colour, which is standard across the trade, stable and permanent. For this stone the treatment has not been tested and there is no laboratory report, so the sensible assumption is the usual one: that it is heated, like nearly all of it.

Cleavage, hardness and how to wear it

At Mohs 6 to 7 tanzanite is softer than sapphire, but the figure that really matters is perfect cleavage in one direction: a single sharp knock along that plane can split the stone no matter how hard it is. A pendant or earrings are safest. For a ring, ask for a bezel and take it off for anything rough. No ultrasonic cleaner, no steam, no sudden temperature change. Warm water, mild soap, a soft brush.

Where it comes from

Commercial tanzanite comes from a single deposit, a few square kilometres in the Merelani Hills of Tanzania – a fact about the gem species rather than paperwork for this stone, which we do not hold.

Ordering

One stone, sold once. Message us on WhatsApp for photographs of the actual stone, and we deliver across Pakistan.

This particular stone

This listing is one natural tanzanite with a weight of 6.1 Carat. Its price is Rs. 12,380 — roughly Rs. 2,030 for each carat. Origin: Tanzania. Treatment: treatment not tested. Quote reference GS-000110 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.

From six carats up a stone becomes the centre of attention. It wants a broader shank or a secure claw setting and suits an occasion ring, a signet or a centre pendant. Clean natural material of this size turns up far less often, and the per-carat rate reflects that.

On the Mohs scale tanzanite rates 6 to 7. That is middle-of-the-road hardness: comfortable in pendants and earrings, and in rings worn with some care. Store it apart from harder stones so it does not pick up scratches, and wipe it with a damp cloth rather than scrubbing.

Whoever you buy tanzanite 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 tanzanite 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): Almost all tanzanite is heated to produce its blue-violet colour; this is standard and 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.