6 x 9 cm or 2½ x 3½ inch.
On this first detail there’s a whipped wheel surrounded by lots of French knots. At the left side there are a few buttonhole bars.
A detail from the other side. Whipped spokes, another whipped wheel, French knots and detached chain stitches.
There’s a bigger photo of this pebble on my Flickr-page.