Quality: DMC,Czech, Korea, Chinese Grade AAA, Chinese Grade AA.
Feature: dazzling brightness, low defect, clear edge & corner, machine cut, high index of refraction
Available Colors: Clear/Crystal, Jet, Black Diamond, Light Sapphire, Sapphire, Cobalt, Blue Zircon, Aquamarine, Peridot, Green, Olivine, Emerald, Jonquil, Smoked Topaz, Light Amethyst, Amethyst, color ab etc.
Quality Control: have better QC to inspect the goods from raw material to package with first-class quality.
Rhinestones are sized by using the term "ss", or stone size, followed by a number to indicate size (e.g. SS8 is equivalent to 2.3 mm, SS10 is 2.8mm). SS is more commonly used for apparel means, while PP (or pearl plate) is used for jewelry.
Size in mm
color chart of austrian crystal rhinestone flat back :
Similar flat back crystal rhinestones for you refer :