Persian art is best known in the West for its carpets. Europeans had their first encounter with Persian rugs by at least the 15th century and the initial impression has never changed; in carpet weaving Iran is considered to have no equal. No researcher can define the exact beginning date of carpet weaving in Iran. The earliest-known Iranian carpet, now named Pazyrik after the archaeological site in Siberia where it was exhumed from the frozen tombs of Scythian chiefs, dates from about 500 B.C. The value of Iranian carpets is determined to a large extent by their patterns. Before weaving a carpet, a professional weaver usually designs the patterns and makes a paper model, representing one quarter of the carpets surface; nomads usually improvise while weaving. The carpet consists of the main portion and the margins; the margins, in turn may be divided into three sections. There is an astonishing variety of patterns in Iranian carpets. Their elaborate composition and minute details reflect a poetic vision of the world and a belief in the efficacy of symbols. Of all the themes which occupy the mind of a Persian carpet designer, the garden is particularly important. Some historians report that when the Muslim Arabs conquered Persian capital “Ctesiphon” in 637, among the fabulous booty they carried away was a huge carpet, depicted a formal Persian garden, made for audience hall of the king’s palace; the idea of Paradise.
Main present carpet weaving centers in Iran include: Qom, Isfahan, Tabriz, Kerman, Nain, Yazd, Kashan and nomadic regions like Baktiari and Qashqai.
One of the most important factors in the longevity and beauty of a rug is the quality of the wool. We have found that the best carpet wools in the world come from Iran, which is why Iranian rugs have always been the most sought after rugs in the world.
Wool quality is determined by the breed and diets of the sheep from which the wool is shorn. Minerals in their water can give the wool extra strength and luster. Feel the rug, massaging the wool between your fingers. If it feels strong, supple, and rich, as opposed to dry, harsh, and crisp, then the wool is of good quality. One thing to be particularly careful of is "tabatchi" or dead wool. This is wool shorn from sheep that have already been slaughtered. Tabatchi wool is very brittle, and will wear out in a very short time. Rub your hand firmly over a spot on the surface of the carpet a few times. If you have more than a tiny bit of loose wool fiber, it is a likely that the rug is made of tabatchi wool. These rugs should be avoided if possible, as they will wear to nearly nothing and the rug will lose all its value within a span of just a few years.
The best wool is called "kurk". Kurk comes from the first shearing of lambs between 9 and 14 months old, and only from the neck and under the arms. Kurk has a feel almost like velvet, but is exceptionally strong.
While it’s true that a higher knot count means that the carpet took longer to make, there are other factors to consider. Knot counts in rugs can vary from as low as 40 per square inch to as high as 1200. Think of knots as pixels on a screen. The finer the knot count, the higher the resolution of the picture. Therefore, higher knot counts work best for rugs with a great amount of detail. Curvilinear designs need higher knot counts. Geometric designs can often do with far lower counts and still be very high quality pieces.
In Iran, most knot counts are measured in "radj". One radj is the number of warp threads in 7 centimeters. A 30 raj carpet is usually considered "commercial" grade, with somewhere between 120 and 140 knots per square inch. Carpets of 50 radj and higher are considered fine carpets. A 50 radj carpet usually has about 330 knots per square inch. An 80 raj carpet, has about 900 knots per inch, and is a truly exceptional piece.weavers normally can tie 4,000 up to 8,000 knots a day. This means that a 9' X 12' carpet woven at 350 knots per inch can take over two years for one single weaver to make.