Marble Chips Pebbles are rock fragments which is smaller than a garden stone. They are rounded and or elliptical in shape, having a diameter of 5-20 mm. when JB Rock started business as distributor and supplier of natural stone in the early 90’s, pebbles are one of a kind which made a consistent demand from both homeowners and contractors as decorative elements. They are often used for landscaping, swimming pool edge and borders, ramps,flooring and many more. Pebbles vary in kind and can be sorted by color and size.