Your main menu needs fixed. You want it to have a list of your collections. Remove the collections, catalog, about us, faq, etc.
Remove all the sharing icons in your header.
Remove the fake countdown timers from your product pages.
add trust seals below your add to cart button
NO ONE will buy when shipping takes 15-35 business days... you do realize 35 bueinsess days is 2 months right??
I would google other sites in the jewlery niche and pattern your stores after them. You can also hire people on fiverr to help you with other optimization tweaks. One that I would recommend is https://www.fiverr.com/share/3wNrk