Like Heriz, Serapi carpets will often have a multiple concentric medallion format that emits jutting branches or vines ending in large stylised palmettes, leaves, or flowers. With framing corner pieces at the periphery of the field. The main border is usually some variant of the ‘turtle’ vinescroll pattern. In terms of design, what distinguishes Serapis from Heriz carpets is once again their more refined approach. The articulation of the medallions is crisper, more finely linear, and open, the highest grade in terms of weave, and very probably the oldest type in terms of age. Heriz carpets are generally coarsely woven with as few as 30 knots per square inch. They also have a deeply depressed warp structure with a markedly ribbed back surface. Since the early twentieth century they have come to make use of light blue cotton wefting. Serapis, in contrast, have a higher knot count, sometimes attaining 80 knots per square inch. Their backs are relatively flat, and they have ivory cotton wefting and generally they have a softer floppier handle than a Heriz.