It is almost invariably either a Shiraz or a Niris if the webs of the ends are long, and the overcasting of the sides has a barber-pole design or has short lengths of different colours. The Niris resembles the Shiraz; but one thread of warp to each knot is more depressed, the ends generally have longer webs, and the field is more frequently covered with large pear designs. It is a Shiraz if short tassels or tufts project at regular intervals from the ends; and it is probably a Niris if it has a long end-web of different coloured stripes.

It is probably a Karadagh, Gorevan, Serapi, Herez, or Tabriz if the sides are finished with a selvage.

Many of these classes have features by which they can be distinguished at once from all others. For instance:

The Sarabend has a field completely covered with pear designs of moderate size facing in opposite directions in alternate lines; borders of several stripes, of which one or two are ivory white with an angular vine from which are suspended mechanically drawn pear designs, and one or two narrow stripes with reciprocal trefoils. Only two other classes are similar: the Iran copies, which are always woven more coarsely and have the Ghiordes knot, and the Burujirds, which are rarely seen.

Most Feraghans have fields that are completely covered with small Herati or Guli Hinnai designs, and have the turtle pattern in the border. The only other rugs that are similar are the Iran copies, which have the Ghiordes knot and are more coarsely woven.

Almost all Hamadans may be distinguished at once by the broad band of camel’s hair surrounding the border, and the coarse weft crossing only once between two rows of knots so as to give a quincunx effect at the back.

Gorevans are invariably of carpet size. They have fields almost covered with central medallions on which are archaically drawn leaves, and a broad central border stripe with a large conventionalised turtle pattern. They have usually the same colour tones, which once seen are not forgotten. The Serapis are similar to Gorevans but are usually older and of better colours.

The Kermanshahs have tones of ivory, pink, and light green, that are softer and lighter than those of almost any other rug. The fields have concentric medallions with dainty floral forms that are rarely seen in other classes except the Sarouks and Kashans; and the borders, that correspond in drawing and colouring with the field, have an outer edging that is almost invariably of pink, but sometimes dark blue. The drawing and colours, which are not easily described but quickly learned, at once distinguish these pieces from all others.

Some Mesheds resemble Kermanshahs, but the nap is more silky, uneven, and lustrous. The texture at the back is finer.

The rugs of Tabriz, which are usually made in carpet sizes, may be distinguished by their linen nap hanging in a short fringe at the ends. They are not likely to be confused with any classes but the Mesheds, Khorassans, and Kermanshahs; but the nap is shorter, and harsher to the touch; the knot is Ghiordes, and the drawing more formal.