A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Nearest Port
Shenzhen Port / Dongguan Port/ Guanghzou Port
Address
6-33# Changping Jewelry Culture Industrial Park Center Changping, Dongguan, Guangdong, China, 518052