A natural tanzanite of 4.90 carats, about 5.38 ratti, at Rs. 16,880 – roughly Rs. 3,445 per carat. Its colour is recorded as Blue.

What to tell your jeweller

If you are buying this to have something made, these are the four things to say before any work starts. Tanzanite is damaged in the workshop more often than in wear.

• Set the stone last. Tanzanite does not like torch heat, and it does not like sudden temperature change. Finish and polish the metal first.
• No ultrasonic cleaner, ever. Not for the finished piece, not "just for a second". The vibration works on the cleavage plane.
• Bezel, not claws, for anything worn on a hand. A full rim of metal is what stands between the stone and a knock.
• Mohs 6 to 7, with perfect cleavage in one direction. Say the word cleavage; a good jeweller will know what it means and handle the stone accordingly.

What is specific to this stone, and what is not

Specific to it: 4.90 carats, Rs. 16,880, and a recorded colour of Blue. Its rate of Rs. 3,445 per carat sits in the middle of our range here, which runs from Rs. 1,909 to Rs. 7,500 across the nine.

Not specific to it: the picture. The photograph on this listing is a catalogue image shared across all nine tanzanite listings on this site – we compared the nine image files and they are one photograph, several of them mirrored. Shape, cut, clarity and dimensions are not recorded either. Message us and we will send photographs and a video of the actual stone, which matters if you are about to commission a setting around it.

Treatment

Rough tanzanite is usually a dull brown. Almost all tanzanite is heated to produce the blue-violet colour the gem is known for: standard across the trade, stable and permanent. For this stone the treatment has not been tested and there is no laboratory report.

Pleochroism, and why the setting angle matters

Tanzanite shows different colours down different crystal directions – blue one way, violet another, a brownish tone down the third. The cutter has already made that choice, but it is worth knowing that the stone has a best face, and that a setting which tilts it can change how it reads. Look at it in daylight before the mount is finalised.

Where it comes from

Commercial tanzanite comes from a single deposit in the Merelani Hills of Tanzania – a fact about the gem species rather than paperwork for this stone.

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 4.9 Carat. Its price is Rs. 16,880 — roughly Rs. 3,445 for each carat. Origin: Tanzania. Treatment: treatment not tested. Quote reference GS-000477 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 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.