Yarn is also marketed under Wool and the Gang Stone Wash.

From the Knit Rowan website:

In collaboration with the talented team at Wool and the Gang, we introduce Stone Washed, a beautiful, 100% cotton tape yarn, perfect for simple stitch textures and stripes. Stone Washed is available in four shades of blue, from Light Aged to Indigo Aged, Denim Aged and Dark Aged.

Yarn used:
Rowan Stone Washed
A. 4(4, 4, 5, 5) balls
B. 3(3 ,3, 3, 4) balls
C. 3(3, 3, 3, 4) balls