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Samples in periodicals archive:
Finer carpets have more knots per square inch, commanding a higher price in the market.
From Capel's Biltmore for Your Home collection, Legacy includes three patterns--Keshan, Gabbeh and, shown here, Shiraz--that are handknotted at 64 knots per square inch.
When purchasing a carpet it is good to know the number of threads per inch -- the more knots per square inch the more expensive the carpet should be.
Thin the carpet over; count the number of knots per linear inch along the warp (length of the rug), the number of knots per linear inch along the weft (width of the rug) and then multiply them to find the number of knots per square inch.
To form the pile, weavers twisted or "knotted' yarn symmetrically around the warp, using as many as 121 knots per square inch.
These Ushak weave rugs are silver washed three times to give them an antique look and feature 64 knots per square inch.
Ward said the rugs in the Reserve Collection "represent the very top of the handmade business," noting the exclusive, limited-edition pieces boast nearly 400 knots per square inch.
In particularly fine examples it is not uncommon to find 2,500 individual knots per square inch.