A measure of how tightly packed carpet fibers are within the pile. Higher density generally indicates better durability and performance. Calculated by multiplying the face weight by 36 and dividing by the pile height.
A structural technique in which alternate warp threads are pulled to a second, lower level inside the rug, so the knots pack into two planes instead of one. This is the hidden engineering behind many very finely knotted carpets: it nearly doubles the achievable knot density and produces a stiff, heavy handle. Running your fingers across the back of a rug and feeling ribbed, offset knot nodes is a classic connoisseur's test for warp depression.
Luxurious Persian carpets from the city of Isfahan in central Iran, considered among the finest in the world. Known for their intricate floral patterns, high knot density (often exceeding 500 KPSI), silk highlights, and exceptional craftsmanship. Traditional Isfahan designs feature a central medallion with elaborate corner pieces and borders.
A carpet knotting technique where the yarn is wrapped around four warp threads instead of the usual two (Turkish knot) or one-and-a-half (Persian knot). This shortcut allows weavers to create carpets more quickly but results in lower knot density and potentially reduced durability. Jufti knotting is sometimes used in commercial production to speed up the weaving process while maintaining the appearance of a densely knotted carpet.
The oldest known pile carpet in the world, woven around the 5th century BC and discovered in 1949 in the frozen tomb of a Scythian noble in Siberia's Altai Mountains. Preserved for some 2,500 years in a lens of ice, it displays a sophisticated symmetrical knotting technique and a density of around 36 knots per square centimeter — proof that carpet weaving was already a mature art form in antiquity. It is displayed in the Hermitage Museum in St. Petersburg.
The flattening of carpet fibers in high-traffic areas or under heavy furniture, resulting in a worn appearance. Can be minimized by selecting carpets with higher density, proper padding, and regular maintenance including vacuuming and professional cleaning.
A type of Persian rug made in the city of Qum (Qom), Iran. Known for their high knot density, intricate designs, and use of silk or fine wool. Qum rugs often feature detailed floral patterns, medallions, or hunting scenes and are considered among the finest Persian carpets.