Diamond Supply Co. T Shirt Diamond Blue New for this season from Diamond Supply Co. we have the range of Old Script tees & every colour looks ace. The tee is made from 100% cotton & features front & rear prints, a ribbed neckline & a stitched hem. This colour way is a lovely blue that the company call Diamond Blue & it looks wicked. If you are after a fresh tee for your wardrobe that looks good anywhere you wear it then look no further. Embroidered logo tag Front & rear branding Ribbed neckline Diamond Blue Description by Adam.