Nearly five carats of Australian fire opal at a modest rate: if size matters to you, this stone is good value. The reference is AG-000716.

Per-carat figures tell you less in opal than they do in sapphire or ruby, because the display of colour counts for so much. A big opal with a quiet display can cost less per carat than a smaller, brighter one. So treat the rate as a starting point and let the photographs, and ideally a short video, complete the picture.

Setting advice

Whatever shape of jewellery you have in mind, opal's hardness of 5.5 to 6.5 on the Mohs scale argues for a protective setting: a pendant or earrings, or a ring with a raised bezel. Silver is the usual starting point, and WhatsApp is the place to talk through a custom silver ring setting.

The origin is Australia, the country best known for opal. Solid opal is usually left as it is, but it is still worth asking about smoke and sugar treatment. We sell solid natural stones and will tell you what we know about this one.

Browse more in the opal collection, and read our gemstone buying guide before you decide.

Open the parcel with the rider at your door and pay only if you are satisfied. Karachi usually 1–2 working days, the rest of Pakistan 2–4, and 7 days to return it.

This particular stone

This listing is one natural australian opal with a weight of 4.75 Carat. Its price is Rs. 8,850 — roughly Rs. 1,863 for each carat. Origin: Australia. Treatment: treatment not tested. Quote reference AG-000716 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.