This 79.25 carat Dur-e-Najaf is a big stone, so check it carefully when it arrives. Here is what to look at.

• Transparency: it should be clear and colourless, with no yellow or grey cast.
• Weight: 79.25 carats, listed at Rs. 6,750, about Rs. 85 per carat.
• Hardness: 7 on the Mohs scale, so it should not scratch from a coin or a key, although a hard drop can chip it.
• Edges and corners: look for nicks, which show up more on a large stone.
• Inclusions: tiny internal lines or cloudy spots are normal in natural quartz and are not damage.
• Reference GS-000219, to quote on WhatsApp.

Clear quartz is not normally treated, and we will happily share what we know about this exact stone if you ask. Your parcel is sent by insured, tracked courier. If it is not right, the seven-day returns policy applies. Other sizes are listed under Dur-e-Najaf, and our buying guide explains how to compare them sensibly.

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.

This particular stone

This listing is one natural dur-e-najaf with a weight of 79.25 Carat. Its price is Rs. 6,750 — roughly Rs. 85 for each carat. Treatment: treatment not tested. Quote reference GS-000219 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 dur-e-najaf rates 7. It handles daily wear, but a hard knock can still nick an exposed corner, so a protective setting is a sensible choice. Clean it with warm soapy water and a soft brush, and keep it away from abrasive cleaners and high heat.

Whoever you buy dur-e-najaf 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 dur-e-najaf 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): Dur-e-Najaf (clear quartz) is usually untreated. 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.