What is Diamond Art? Diamond Art is a fun and easy activity for crafters both young and old. It's a pretty new art form but it's popularity has been phenomenal! It breaks images down into patterns, very similar to cross stitch embroidery or paint-by-numbers. Small, glossy, 'diamond' like rhinestones are applied to a canvas to make the pattern according to the legend. Diamonds are colour matched to the symbols to create a masterpiece!