Sorry, we have very few US-based members - most are Australia-, Thailand- or UK-based. Your query is quite specific... do you have an Asian Quarter in any of the big cities near you? You might find specialist shops there perhaps selling Thai jewellery... I would certainly advise inspecting the jewellery in person rather than buying over the internet from Thailand as you never know what you're going to get...
Or how about booking a trip to Thailand and buying some yourself in person there? We might not be able to help with 23 carat gold, but we
can help you with hotels and ideas of things to do in the Land of Smiles