This one may surprise you. For 4.40 carats, it carries the lowest rate per carat in this whole group of opal listings. It is a natural Australian opal, reference AG-000717.

Why so low? Opal is priced on how it looks, not on weight, and a quieter display brings a lower rate. We say that plainly because an honest dealer should. The listing does not promise a vivid show of colour, so look at the photographs closely and ask us for a video before you decide.

It could suit someone who wants a larger opal as a first purchase, someone working out a design with a jeweller, or a piece where size matters more than fireworks. Ask for whichever angles you want to see and we will do our best.

Opal is soft, 5.5 to 6.5 on the Mohs scale, so wear it gently and keep it out of heat. As for treatment, solid opal is usually left as mined, though smoke or sugar treatments exist and doublets are traded too. Ours is solid natural opal; ask us what we know.

More choices are in the opal collection, and our gemstone buying guide explains how to compare them.

Pay only after you have opened the box and looked. Karachi deliveries usually take 1–2 working days, other cities 2–4, with 7-day returns.

This particular stone

This listing is one natural australian opal with a weight of 4.4 Carat. Its price is Rs. 3,380 — roughly Rs. 768 for each carat. Origin: Australia. Treatment: treatment not tested. Quote reference AG-000717 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.