Hold a moonstone still and it looks like milk glass; tilt it and a pale blue light wakes up inside. That small piece of theatre is the whole appeal of this 6.45 carat stone from Ceylon (Sri Lanka), which has a milky white body and a bluish adularescence.

The glow is a property of the feldspar crystal structure rather than any added colour, and it is best seen in soft, bright light with the stone slowly rotated. The stone is translucent, and at 6.45 carats it is a moderate size: noticeable, wearable and not heavy. Hardness is 6 to 6.5 on the Mohs scale, so a pendant or a carefully set ring in silver suits it best.

We price it at Rs. 3,980, which is about Rs. 617 per carat. Treatment is not the norm in moonstone, though that is true of the family and not a promise about one stone. Ask us on WhatsApp about this exact piece, and we can arrange independent lab testing. Quote GS-000418.

The June birthstone guide covers moonstone's place among birthstones if you are buying for someone born that month.

Order with Cash on Delivery anywhere in Pakistan: open the parcel, check the stone, then pay. If it is not right for you, you have 7 days to return it.

This particular stone

This listing is one natural moonstone with a weight of 6.45 Carat. Its price is Rs. 3,980 — roughly Rs. 617 for each carat. Origin: Ceylon (Sri Lanka). Treatment: treatment not tested. Quote reference GS-000418 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.

From six carats up a stone becomes the centre of attention. It wants a broader shank or a secure claw setting and suits an occasion ring, a signet or a centre pendant. Clean natural material of this size turns up far less often, and the per-carat rate reflects that.

On the Mohs scale moonstone rates 6 to 6.5. That is middle-of-the-road hardness: comfortable in pendants and earrings, and in rings worn with some care. Store it apart from harder stones so it does not pick up scratches, and wipe it with a damp cloth rather than scrubbing.

Whoever you buy moonstone 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 moonstone 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): Moonstone is usually untreated. 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.