Here are the questions we hear most about this 2.1 carat Australian opal, reference GS-000575. It is a natural stone at Rs. 15,750, about Rs. 7,500 per carat.

Is that a good rate for opal?

It depends on brightness and the colour display, which a rate cannot capture. Ask for photos or a video on WhatsApp +92 308 887 3888 and compare with other pieces in the opal range.

Could it have been treated?

Smoke and sugar treatments are known in the opal trade, though plenty of solid stone is sold as found. Tell us you are interested and we will say what we know about this stone.

Will it scratch in a ring?

Possibly. Opal is 5.5 to 6.5 on the Mohs scale, so grit and hard surfaces can mark it. A pendant is the safer choice, and a bezel the safer ring setting.

What if I do not like it?

Open the parcel before paying with Cash on Delivery, and you have 7 days from delivery to return it.

Before you choose, read our gemstone buying guide.

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 GS-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, a certificate is available on request, 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. Certificate available on request. 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.