When sourcing Oriental rugs, the most critical technical metric is KPSI (Knots Per Square Inch); higher KPSI generally indicates finer detail and greater durability. You must also verify the material composition, prioritizing 100% hand-spun wool, silk, or wool-silk blends over synthetic fibers. For hand-knotted pieces, inspect the fringe integrity (it should be an extension of the warp threads, not sewn on) and the dye quality, ensuring the use of colorfast vegetable or high-grade chrome dyes to prevent bleeding during cleaning.