For professional B2B sourcing, you must prioritize Type A Jadeite, which is 100% natural, untreated, and only polished with wax. Type B involves acid bleaching and polymer injection to improve clarity, while Type C is artificially dyed. Always demand a CMA (China Metrology Accreditation) or NGTC (National Gemstone Testing Center) certificate for each piece, as these are the gold standards for authenticity in China. Type B and C jade have significantly lower resale value and poor long-term durability.