MyEcomFulfillment.com is one vendor you can use to fulfill custom jewelry items.
If you plan to sell jewelry items fulfilled by MyEcomFullfillment, be sure to visit their website and setup and account with them.
Description From Their Website
"My Ecom Fulfillment is a simple and easy way to get products to your customers. We focus on simple and effective shipping, to take the guesswork out of fulfillment, for you!"
Product Pricing, Production and Delivery Times
About Product SKUs