I recomment using the new shop stats to determine what people are searching here rather than on Google. I, like you, have never gotten anything terribly accurate according to how people have searched and found me. Howeveryou can use Google Adwords and search for words that are relative to your shop and how often they are searched. For you that may be keywords like 'titanium earrings' or 'wearable art' or 'sculptural jewelry.' You just have to go to Keywords/Adwords, and type in such phrases and it will show you how often they're searched.
I know that may have been a bit confusing, but I hope it helped.