Greenish blue is a recognised colour range in sapphire, and Australia is one of the places that produces it. Before buying this 2.4 carat stone, a careful buyer should ask how it was treated, since heating is widespread in the sapphire trade, intended to improve colour and clarity. Stones left unaltered exist but are rarer and cost more.

What we can say for this piece, reference GS-000865, is that it is a natural sapphire with Australia given as the origin, a greenish blue colour, and a hardness of 9 on the Mohs scale. We do not claim more than that. If you want to know what we have learned about this particular stone, message us on WhatsApp, and independent lab testing can be arranged on request.

Price and weight

The weight is 2.4 carats and the price is Rs. 18,750, which works out to about Rs. 7,813 per carat. The tone suits silver and white-metal settings, where cool colours look their best.

Browse similar listings in the sapphire collection.

Pay Cash on Delivery once you have opened the parcel and seen the stone yourself, anywhere in Pakistan, with 7 days to return it if you change your mind. Before you choose, read our gemstone buying guide.

This particular stone

This listing is one natural australian opal with a weight of 2.4 Carat. Its price is Rs. 18,750 — roughly Rs. 7,813 for each carat. Origin: Australia. Treatment: treatment not tested. Quote reference GS-000865 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.