Dear nakatib,
Semi Precious & Precious Stones seem to have good demand in countries like USA & UK and you may want to list your products directly on those sites.
To know the potential of your products in these markets, do a search ( particulary Completed Listing Search)to understand what type of pricing, product description etc are working in these countries.
Alternatively, you can also choose to list internatioanlly through eBay india where your product is available locally and across all international countries that eBay has its presence in.
In order to have a better understanding on trading internationally, you may want to visit our Global Trade Hub where all possible information regarding international selling is available
http://pages.ebay.in/ebayexplained/international_selling.html
Warm Regards,
Tanya Goel