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About product and suppliers:
            613 gem detector products are offered for sale by suppliers on Alibaba.com, of which industrial metal detectors accounts for 15%, jewelry tools & equipment accounts for 4%. 

A wide variety of gem detector options are available to you, 

There are 158 suppliers who sells gem detector on Alibaba.com, mainly located in Asia. The top countries of suppliers are China, Hong Kong S.A.R., from which the percentage of gem detector supply is 97%, 2% respectively.