When sourcing silk ribbons, the primary indicator of quality is the momme weight (mm), which measures the density of the silk; for premium applications, a weight of 12-16mm is ideal. Buyers should verify the weaving density to ensure a smooth, lustrous surface without snags. For garment use, ensure the ribbon has finished edges (selvedge) to prevent fraying. Additionally, request colorfastness test reports (Grade 4 or higher) to ensure the dye does not bleed onto the primary product during washing or storage.