•  In general, older rugs tend to be of greater interest to collectors, and therefore carry greater value. For a rug, 100 years or more is considered quite old, as few survive in good condition based on the heavy wear they receive. Rugs as little as 50 years old can be sought after as antiques.

•  Overall design is of critical importance, as the harmony of the colors, and the patina that the naturally dyed fibers acquire over time will have a significant impact on the value of a particular piece.

•  The highest quality rugs are those produced in Central Asia using traditional techniques. More recent rugs designed to reproduce these styles, often made in China, India or Pakistan, are generally of lesser interest to collectors.

•  Rugs are generally named based on the region, style or specific weaver. Herez rugs, for example, come from this major weaving center in northwestern Iran.

•  Many collectors prefer traditional rugs made for specific use by nomadic peoples over rugs made for use in urban homes or for the export market.

•  Hand-woven rugs will have the pattern visible on the back as well as on the surface. By parting the pile to look for rows of knots at the base of each tuft, one can see whether the rug is hand made. A rug that lacks these knots is generally machine made and of little interest to collectors.

•  A high knot count, determined by counting the amount of knots per square inch, is a good indication of a quality rug but is not the only factor which should be taken into consideration.  A grouping of traditional rugs with wonderful designs can have a wide a range of knot counts per square inch.

•  Natural dyes were used exclusively until about 1920, when chemical dyes were introduced. Chemical dyes are often garish in comparison and lack strength. Some chemical dyes will run so easily they will come off with a moist handkerchief.

•  Rugs that have been cut or altered will be significantly reduced in value.

•  Today many rugs are copied and artificially distressed, resulting in convincing fakes. It is important to work with reputable dealers and consultants when building a collection. Research and taking the time to compare a wide range of rugs can also assist with future purchases.

•  Like any other market supply and demand control the prices, and rug styles fall in and out of fashion.

•  Rugs should only be cleaned or repaired by specialists experienced in handling that specific type of rug.