19.70 carats — 21.65 ratti — at Rs. 3,000, about Rs. 152 per carat. The reference is GS-00087.

What these stones cost

All four here sit between about Rs. 147 and Rs. 152 per carat, so weight is effectively the only thing separating their prices. That is normal for opaque ornamental stones: they are sold by size and by the interest of the pattern rather than by clarity or colour grading, and there is no premium band to climb.

What the photograph actually shows

Measured from the picture, this stone reads 100 out of 255 in brightness and 29% in saturation — the strongest colour of the four, though still a muted one. It is a warm reddish-brown with darker cloudy zoning running through it, and it is noticeably more translucent than the others: light enters the dome and the highlight sits inside the stone rather than purely on its surface.

Its colour varies across the face by 32 points of lightness, so the zoning is visible but gentle rather than dramatic.

That translucency is worth mentioning, because true jasper is opaque. A semi-translucent brown stone of this kind is usually closer to a chalcedony or agate. We have not had it tested, so we are not going to put a firm name on it beyond what you can see.

The cut

A rectangular cushion with softened corners and a domed top — a cabochon rather than a faceted stone, which is the right choice for an opaque or semi-translucent material where the pattern matters more than sparkle.

Wearing it

Nearly 20 carats makes a substantial men's ring or a solid pendant. The rectangular outline drops neatly into a plain silver bezel, and a bezel protects the corners, which are the vulnerable part of any rectangular stone.

Care

Warm water and a soft cloth. Avoid ultrasonic cleaners and sudden temperature changes. Its treatment is recorded as "not tested" rather than untreated.

We are happy to arrange an independent identification before you buy — message +92 308 887 3888 with the reference. The other three stones are in the jasper category.

Cash on Delivery is available across Pakistan, so you inspect the stone before paying, and returns are accepted within 7 days of delivery.

This particular stone

This listing is one natural jasper with a weight of 19.7 Carat. Its price is Rs. 3,000 — roughly Rs. 152 for each carat. Origin: Africa. Treatment: treatment not tested. Quote reference GS-00087 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.

Above twelve carats you are into collector territory. Pieces this heavy are usually set as pendants or kept loose, and they are prized for the size of rough they came from. If you do set it, choose a bezel or a heavy claw to protect the edges.

On the Mohs scale jasper rates 6.5 to 7. 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 jasper 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 jasper 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): Jasper is usually untreated, though some is dyed. 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.