They are a gold supplier with 6 years on Alibaba. It's a manufacturer/trading company. I've checked all the details on Alibaba and the companies website, and I didn't see any indication that they are a scam.
I got a proforma invoice yesterday with the item description, unit cost, qty, amount, and packing info. I'm having it shipped via DHL, and paying with Paypal. My biggest concern is that the Paypal email address is not from the companies domain. It's from 163.com. The proforma invoice only has my first name, since I haven't given them my full name and address yet. Are these red flags? Should I walk away. Thanks.