A 6.75 carat Madagascar ruby, at the finer end of our range. Check the points below, then ask us anything the listing leaves open.

• Weight 6.75 carats, a heavy ruby that wants a firm setting.
• Origin Madagascar; colour red.
• Hardness 9 on the Mohs scale, though a hard knock can still chip an edge.
• Heating is the norm in ruby, and some stones are glass-filled to hide fractures; ask what applies here.
• Look at it in daylight and by lamp when you open the parcel, and check that the colour stays even.

The reference is AG-000549. Message us with it on WhatsApp and we will tell you what we know about the stone. You pay after inspecting it.

To compare with smaller or larger pieces, the ruby category lists them, and the ruby quality article explains how buyers judge colour.

We send it by insured, tracked courier with Cash on Delivery, so you see the stone before any money changes hands. Karachi is usually 1–2 working days, other cities 2–4, and returns are accepted within 7 days.

This particular stone

This listing is one natural ruby, known in Urdu as Yaqoot, with a weight of 6.75 Carat. Its price is Rs. 54,000 — roughly Rs. 8,000 for each carat. Origin: Madagascar. Treatment: treatment not tested. Quote reference AG-000549 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 ruby rates 9. 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 ruby 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 ruby for those three points before it is listed, 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. No lab report yet; independent testing welcome. As general background (not a statement about this stone): Most ruby (yaqoot) is heated, and lower grades may be glass-filled; we do not sell glass-filled ruby as natural ruby. 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.