Seam Agate Oval Cabochon 25x18mm 20ct – Natural Gemstone Pedra Gems

Discover generous natural beauty from Pedra Gems — our Natural Seam Agate Oval Cabochon, a beautifully rounded 25x18x5mm gemstone weighing 20 carats, cut into a wide, full-bodied oval silhouette that showcases the rich natural banding of Seam Agate across an exceptional face area.

At 25x18mm this oval has a near 1.4:1 length-to-width ratio — one of the widest and most rounded oval proportions in the Pedra Gems collection. This generous width creates a stone with maximum face area, displaying the natural banding of the Seam Agate in all its layered glory. Not an elongated oval, not a narrow stone — this is a full, confident, beautifully rounded gem.

✦ Stone Specifications:
• Shape: Oval
• Dimensions: 25 x 18 x 5 mm
• Weight: 20 Carats
• Stone Type: Natural Seam Agate
• Cut: Cabochon (flat back, domed top)
• Finish: High-polish, smooth surface
• Please note: As these are natural gemstones, size and weight may vary slightly. Dimensions may differ by ±0.5mm and weight by ±0.5ct from the listed measurements.

✦ Perfect For:
• Classic oval pendant & statement necklace designs
• Oval bezel ring settings — wide ovals make exceptional ring centrepieces
• Wire wrapping & bezel settings
• Bridal & occasion jewellery making
• Boho & artisan jewellery collections
• Everyday wearable statement pendant
• Crystal healing & grounding energy work

✦ Why This Wide Oval?
The 25x18mm proportions give this stone a wide, rounded form that sits between a classic oval and a near-circle in character — full, generous, and visually rich. That generous width means more natural agate banding is visible across the face of the stone than any of our narrower oval cuts.

For ring settings, a wider oval like this is particularly flattering — the broad face elongates and widens the appearance of the finger beautifully, creating a statement ring that draws attention from across a room. For pendant settings, the wide face creates a rich, substantial centrepiece that wears confidently on the neckline.

The 5mm dome adds excellent depth and warm light play across the polished surface — a classic dome height that gives this stone beautiful visual presence from every angle without being so high as to look bulky.

At 20 carats this is a premium stone with genuine substance. The weight combined with the wide face makes this one of the most satisfying and impressive natural cabochons in the Pedra Gems oval range — a stone that jewellers and collectors will immediately appreciate as exceptional quality.

✦ About Seam Agate:
Seam Agate is a natural chalcedony formed within rock seams and fissures, producing its characteristic richly layered banding in warm, earthy tones. No two stones from Pedra Gems share the same pattern, colour, or flow — every cabochon is a completely unique piece of natural art.

Celebrated for its grounding and stabilising energy, Seam Agate is beloved by crystal practitioners and artisan jewellers worldwide. Its warm earthy tones complement sterling silver, gold-filled, and copper wire settings beautifully.

Order today from Pedra Gems and receive a hand-selected natural gemstone — fully polished, flat-backed, and ready to become the generous, beautiful centrepiece of your next jewellery creation.