Diamond willow is a type of tree with wood which is transformed into diamond-shaped segments that have alternating colors.

Salix bebbiana, the most common, is a species of willow indigenous to Canada and the northern United States, from Alaska and Yukon south to California and Arizona and northeast to Newfoundland and New England.

This species is also called red willow by Native Americans according to The Arctic Prairies Appendix E by Ernest Tompson Seton.

Diamond willow is prized by wood carvers and furniture makers for its strong contrasting colors (red and white) and its sculptural irregularity of shape.

There are at least six different species that have been identified as being susceptible to diamonding, including Salix bebbiana (the most common[2]) plus S. pseudomonticola, S. arbusculoides, S. discolor, S. scouleriana, and S. alaxensis.

If the tree has been affected in several places close together, then the diamonds run into each other, resulting in pronounced ridges if some sapwood continues to survive.