On a chain, 3.70 carats of opal is a statement piece. This Australian stone is large for its kind and needs no heavy metalwork around it.

When you weigh up opal, look past the total price and think about what you are paying for. Brightness and the way colour flashes across the face are what lift an opal's value, and those are easier to judge from a short video than from a still photograph. Ask us for one on WhatsApp, quoting the reference AG-000567, and we will send what we have.

How to set it

Opal measures 5.5 to 6.5 on the Mohs scale, well below ruby or topaz, so it marks more easily. A full bezel that wraps the edge is the sensible choice. A pendant or brooch keeps it out of harm's way; an everyday ring does not. Keep it from heat and strong chemicals.

On treatment: solid opal is often sold as mined, but smoking and sugar treatment do exist in the trade. We sell solid natural opal only and will tell you plainly what we know about this one. There is more to compare in our opal collection, and the gemstone buying guide is a good first read.

Pay Cash on Delivery after you have looked at the stone with the rider waiting. Karachi deliveries usually take 1–2 working days, and you have 7 days to send it back unused.

This particular stone

This listing is one natural australian opal with a weight of 3.7 Carat. Its price is Rs. 22,130 — roughly Rs. 5,981 for each carat. Origin: Australia. Treatment: treatment not tested. Quote reference AG-000567 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.

Whoever you buy australian opal 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 australian opal 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): Solid opal is usually untreated; some opal is smoke- or sugar-treated, and doublets/triplets exist — we sell solid natural opal. 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.