These are the questions people ask us most about this 2.10 carat Australian opal, reference AG-000575.

Is it good value?

That comes down to brightness and the display of colour, which no rate per carat can capture. Ask for photos or a video on WhatsApp and set it beside other pieces in the opal range.

Could it be treated?

Smoke and sugar treatments are known in opal, although a lot of solid stone is sold exactly as found. Tell us you are interested and we will say what we know about this one.

Will it scratch in a ring?

It can. Opal is 5.5 to 6.5 on the Mohs scale, so grit and hard surfaces will mark it over time. A pendant is the safer choice; in a ring, choose a bezel.

What if I change my mind?

You open the parcel before paying, with the rider waiting, and you also have 7 days after delivery to return it unused. Our gemstone buying guide has more general advice.

Karachi orders normally arrive in 1–2 working days and other cities in 2–4, all on Cash on Delivery.

This particular stone

This listing is one natural australian opal with a weight of 2.1 Carat. Its price is Rs. 15,750 — roughly Rs. 7,500 for each carat. Origin: Australia. Treatment: treatment not tested. Quote reference AG-000575 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.