Hi wallenchi,
These are American jewelry manufacturers in USA. Very few of them indicate if they do have manufacturing facilities outside of the USA, and I think you may need to get in touch with the supplier directly to confirm. I tried to check if they have factories in China as I go along each supplier, and here's what I found.
Link hidden: Login to view Their designs are Copyrighted, which ensures that you will not find these pieces in your local jewelry stores (unless they purchased them from this company).
Link hidden: Login to view Has been in the jewelry business for over 10 years
Link hidden: Login to view located in Waipahu, Hawaii, been in business for over 25 years
Link hidden: Login to view
*** Link hidden: Login to view They have a direct partnership with a factory in China and have been in the jewelry business for over 18 years. Please note that you are viewing their retail site. To avail of their products at wholesale prices simply contact them and look for Jared.
Link hidden: Login to view Their manufacturing facilities are located in Bangkok. Thailand
Link hidden: Login to view
The list is long under jewelry manufacturers in our directory. You may do further search by clicking on the Directory tab, and typing in 'jewelry' (or you can be more specific, 'authentic jewelry', 'costume jewelry', 'cz', 'genuine diamond'). Filter your search to 'Manufacturers' by clicking on 'More Options'.
Hope this helps. Kindly write a review if you get the chance to use any of the suppliers to share your experience with the SaleHoo community.
Cheers! :)