Five and a half carats is a good size for tanzanite. Gem-quality crystals are usually small, so a stone over five carats counts as a substantial piece, big enough for a ring to catch the eye yet not so heavy that it feels awkward. It also makes a fine pendant without needing a large mount.

This particular tanzanite weighs 5.5 carats and costs Rs. 10,500, which works out to about Rs. 1,909 per carat. Hardness is 6 to 7 on the Mohs scale, so the stone is a little softer than quartz, and benefits from a bezel or protective setting.

What to look for in tanzanite

Look at the colour from different angles, as tanzanite can shift between blue and violet. Bear in mind that tanzanite is routinely heated for colour, a stable and accepted practice. Check for chips at the corners. For this stone, message us on WhatsApp quoting GS-000109 and we will share what we know. Independent lab testing is available. Browse the tanzanite category for others.

Pay Cash on Delivery once you have opened the parcel and seen the stone yourself, anywhere in Pakistan, with 7 days to return it if you change your mind. Before you choose, read our tanzanite guide.

This particular stone

This listing is one natural tanzanite with a weight of 5.5 Carat. Its price is Rs. 10,500 — roughly Rs. 1,909 for each carat. Treatment: treatment not tested. Quote reference GS-000109 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.