Tumbled Basalt Stones (20mm)
Cubic Metre Calculator
Need to calculate how much you’ll need? Use our cubic metre calculator below.
Use the calculated volume as a guide to select your quantities below. Products on our website are sold in either 1m³ or 1/3m³ (0.333m³) increments, so you may need to combine the 1m³ and 1/3m³ options to match your required volume as closely as possible. If your required quantity cannot be accurately matched using these increments, please contact our office for assistance.
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Frequently Asked Questions
Bring a sophisticated, natural look to your garden with our Tumbled Basalt 20mm pebbles. These semi-rounded stones have a deep charcoal-grey hue that works perfectly around pavers, garden beds, pathways, and feature landscaping areas. Locally sourced and tumbled for a smooth finish, they’re comfortable underfoot and add a striking contrast to lighter garden elements.
Tumbled Basalt Benefits:
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Ideal for pathways, garden beds, and decorative features
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Smooth, tumbled finish for a premium feel
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Locally sourced, high-quality basalt
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Complements other landscaping elements and lighter coloured rocks
Specifications:
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Size: 20mm
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Sold in increments of 1/4m³, 1/3m³, 1/2m³, and 1m³
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Delivered
Note: There is colour variation in the stock of this product. We recommend viewing the colour in our yard before purchase. Imagery may appear darker than stock in the yard.
Looking for a true black finish?
Natural stone quarried from the earth cannot achieve a perfect jet-black colour and will always present as dark grey or charcoal. If your project vision requires a deeper black appearance, our Kashmiri Black polished pebble range—which is cut and polished rather than naturally tumbled—may be a better fit. These are available in small bags and offer a richer, darker tone suited to 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 for at least 24 hours of dry weather to view the true shade of your stones.
