TABRIZ rugs and carpets usually have curvature in their patterns. I should also mention that you could find some tribal patterns that are made in surrounding villages and selling as TABRIZ.
The quality of TABRIZ rugs and carpets are varies. The older (before 1945) are very good, but some of the newer TABRIZ rugs and carpets are not as good as old ones. Some of the newer rugs have a lower number of Knots Per Square Inch (KPSI) and they are chemically dyed instead of 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 have different sizes. The majority of them are mid 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 the ivory color being a beautiful contrast. There are other colors, which exist, in newer carpets such as soft green, blue and brown.
Soft wool, thin, tight piles.
Warps are mostly cotton,wefts either cotton or wool.
Inspection of the back of the carpet is important because the weavers in TABRIZ use both Turkish and Persian knots. The numbers of knots are varies, depending on the quality of the carpet, which usually averages around 120 KPSI (30 RAJ) up to 842 KPSI (80 RAJ).
Apart of being the best looking TABRIZ rugs and carpets are also one of the nicest quality carpets. These rugs and carpets are in high demand therefore, it is more costly then some of the other carpets. Prepare yourself to pay $4-$35 Per Square Feet (PSF) for a very prized and beautiful carpet from TABRIZ. Keep in mind that you will also pay more as the number of the KPSI increase.
More info on TABRIZ rugs at Jozan.com,
JBOC's Notes, and OldCarpet.com