Almost the only Persian rug that has small, geometric, adventitious designs and latch-hooks is the Shiraz. It is the only one that has small tufts of wool projecting from the sides; and with the exception of the Niris is the only one that, as a rule, has a barber-pole overcasting and a long web at the ends. It is also one of the most loosely woven.
The Sarouk and Kashan may be distinguished from all others by their short velvety nap; dark rich colours; fields of graceful foliated stalks and floral forms resting on concentric medallions; and the fine, firm, texture of the weave. A carefully drawn design of the running latch-hook appears in the borders; and the weft is usually some shade of blue. The Kashans are almost the same as Sarouks but have closer weave and finer texture. They very rarely come in large sizes.
Muskabads and Mahals are invariably made in large carpet sizes. Their texture is firm; they are very coarsely woven; and there is great irregularity in the size of the knots as shown at the back. Of the two, the Mahals are the better grade.
A large rug with woollen warp and with one thread of warp to each knot doubled under the other is almost always a Bijar.
Sehnas are always very thin rugs and of small or moderate size. With few exceptions the field is covered with Herati or pear designs. They can be identified by the quincunx appearance of the fine cotton weft at the back and the file-like feeling of the weave.
The only Persian rug that has a side selvage and also shows evidence of Caucasian influence in the geometric drawing of the patterns is the Karadagh.
The Gozenes may be distinguished from other classes by their dull colours. In many of them each thread of warp is encircled by the right half of some knots and the left half of others.
The Asia Minor rugs have so many features in common that they cannot conveniently be divided into sub-groups. For instance: almost all have a coloured weft, a coloured web with fringe at the ends, and a selvage at the sides; all, excepting the Ghiordes and a few modern pieces, have woollen warp and weft; and all have the Ghiordes knot. To be sure, a distinction may be made in the length of the nap, since as a rule the Bergamo, Rhodian, Karaman, Yuruk, and some of the Anatolians have a long nap; and the remainder usually have a short nap; and also in the weaving, as in the Bergamo, Ghiordes, Karaman, Kulah, and Ladik, one thread of warp to each knot is generally depressed, and in the remaining classes all threads of warp are equally prominent; furthermore, Anatolians, Bergamos, Karamans, Rhodians, and Koniehs, have rarely more than three stripes to the border; and Kir-Shehrs, Kulahs, Ladiks, and Ghiordes have seldom less than five; but these features are not always constant and pronounced. The patterns, therefore, and those smaller designs which frequently are peculiar to a single class are of considerable assistance in distinguishing one from the other. The arch of the namazliks is also an invaluable feature for identification since its shape is different in each class as will be seen by reference to Plates C and D (Pages 61 and 63).
Leaving out of consideration modern pieces, made to meet the demands of exporting companies, the Bergamo and Rhodian have certain points of resemblance. As a rule, they are almost square, and have long nap, long webs with coloured bands at the ends, a side selvage, and coloured weft. The Rhodian may generally be distinguished by their brighter colours and their panels, suggesting windows, placed parallel to the length of the rug. The Bergamos, which are more frequently seen, have rich, deep blue and red colouring, and more devices to avert the evil eye than any other Oriental rug.
Two panels, one above the arch and the other below the field, are almost invariably seen in the Ghiordes prayer rugs and occasionally in the Kulahs, but rarely in any other classes. The typical pattern of the central border stripe of Ghiordes prayer rugs, consisting of most conventionalised leaf and rosette, is not seen in any other rugs; nor is the pattern of the broad border stripe of the odjaliks and sedjadehs, consisting of an undulating band covered with small flecks and fringed with latch-hooks.