I have added this informational pages about Kashmir Silk rugs to give some added information about them and to explain the differences in qualities between the Kashmir rugs with the unique Single Knot quality and the more common 18/18 quality.
Kashmir silk rugs are typically not knotted and in fact woven, which allows the weavers to produce at a faster rate than traditonally knotted Persian rugs. This means that the silk thread is not individually knotted into the foundation, but the threat stays as one long string and is slong through the width of the rug. Then the silk pile is knotted into the rug and the next threat is added. The 18/18 quality Kashmir rugs have a short silk pile and are a bit finer, but are also much more durable than the lower quality 14/14 and 16/16 Kashmir rugs.
Kashmir silk rugs with a single knot quality are very hard to find and we are one of the few that have them custom made for us. Unlike the standard Kashmir silk rugs, the single knot pieces are woven very much like the standard Persian rugs and each threat is knotted into the carpet instead of being woven. This results is a much stronger and solid pile and the thickness of the single knot Kashmir rugs equals that of the high quality 50 Raj Tabriz rugs, but with a solid silk pile. My clients who are familiar with the Kashmir silk rugs always point out how much more detailed and better the single knot Kashmir rugs are compared to the 18/18 pieces.