When sourcing diamond lace, the quality is determined by the base material, the stone grade, and the attachment method. Ensure the base mesh is made of high-density nylon or polyester to prevent tearing under the weight of the stones. For the 'diamonds,' verify if they are AAA-grade glass rhinestones, resin, or acrylic; glass offers the highest refractive index and brilliance. Additionally, check the stone density (stones per square inch) and the fixation technique—hot-fix is common for mass production, while hand-sewn or prong-set stones offer superior durability for high-end bridal or evening wear.