At 18.45 carats, this black agate is large by any measure, and in agate terms that means a stone for a gents' ring or a bold pendant. It is a size you wear on purpose. On a slim hand it makes a statement; on a broad one it looks balanced, so think about the wearer before you decide.

What to check at this size

More surface means more chance of flaws, so look over the whole face for evenly applied colour, a smooth polish and a clean edge. Black agate is dyed as standard, so an even black is expected. Hardness is 6.5 to 7, fine for a ring with a good bezel.

It carries the highest rate per carat in this group of black agates, though still modest for a stone of this weight. Our reference is AG-BL-0024.

If you are not sure it will suit you, message us on WhatsApp, describe your hand and your usual jewellery, and we will tell you honestly what we think.

Compare it with others in the black agate collection. Before you choose, read our black agate guide.

Cash on Delivery across Pakistan, so you check before paying. Karachi usually 1–2 working days, other cities 2–4, and returns for 7 days.

This particular stone

This listing is one natural black agate with a weight of 18.45 Carat. Its price is Rs. 3,750 — roughly Rs. 203 for each carat. Treatment: treatment not tested. Quote reference AG-BL-0024 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 black agate 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 black agate 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 black agate 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): Black agate is almost always dyed — it is standard for the stone. 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.