Tumbled Basalt Rocks (20-40mm)

Our Tumbled Basalt 20-40mm pebbles are a bold, natural stone with a deep charcoal-grey tone and a smooth, semi-rounded finish. Sourced locally and tumbled for comfort underfoot, this larger format basalt is ideal for feature garden beds, pathways, pots and areas where you want contrast against lighter landscaping materials. Often chosen by customers searching for black rocks or black pebbles, tumbled basalt delivers a strong, dark aesthetic while retaining the natural variation and texture of real stone.

Tumbled Basalt Benefits:

• Ideal for garden beds, pathways, pots and feature landscaping

• Larger 20-40mm size creates a strong visual impact

• Tumbled for smoother edges and a more refined finish

• Durable, high-quality basalt sourced from a local quarry

• Works beautifully alongside lighter stones for contrast

Specifications:

• Size: 20-40mm

• Sold in increments of 1/4m³, 1/3m³, 1/2m³ and 1m³

• Delivered

Looking for a true black stone?

If you’re searching for black rocks or black pebbles, it’s important to note that natural stone quarried from the earth cannot achieve a perfect jet-black colour — even the darkest basalt will present as deep grey or charcoal. For projects that require a richer, darker black appearance, our Kashmiri Black polished pebble range may better suit your vision. These are cut and polished stones (rather than naturally tumbled) and are available in small bags for feature areas.

Note: Rock colours appear darker when wet. For an accurate shade, view them dry or ask our staff for dry samples or photos of the product when dry. If you receive a delivery when it is or has been raining, wait at least 24 hours of dry weather to view the true colour of your stones.