TABRIZ rugs and carpets usually have curvilinear patterns. I should also mention that you find some tribal patterns made in surrounding villages that are sold as TABRIZ.
The quality of TABRIZ rugs and carpets varies. The older ones (before 1945) are very good, but some of the newer TABRIZ rugs and carpets have a lower number of Knots Per Square Inch (KPSI) and they are chemically rather than vegetable dyed. TABRIZ rugs and carpets are highly prized because they are one of the best-looking carpets in IRAN and the world.
Size & Shapes:
TABRIZ rugs and carpets come in different sizes. The majority of them are mi-size (4x6 to 8x10 feet). You can also find large rugs up to 10 x 18 feet.
Dark red and powerful blue colors predominate, with ivory forming a beautiful contrast. Other colors such as soft green and blue and brown are found in newer carpets.
Soft wool; thin, tight pile.
Warps is mostly cotton; wefts is either cotton or wool.
Inspection of the back of the carpet is important because the weavers in TABRIZ use both Turkish and Persian knots knots. The quality of the carpet depends upon the number of knots, which varies, but averages from around 120 KPSI (30 RAJ) up to 842 KPSI (80 RAJ).
TABRIZ rugs and carpets are among the nicest looking and finest quality carpets. They are therefore in high demand and are more costly then some other carpets. Expect to pay $4-$35 Per Square Foot (PSF) for a carpet from TABRIZ. Keep in mind that, as a rule, the higher the KPSI, the greater is the price.
More info on TABRIZ rugs at Jozan.net.
More info on TABRIZ rugs at JBOC's Notes.