Want to change bulk prices in some specific products

Dear Sir,
i am new to woocommerce and having website with woocommerce ” https://www.eaglejewels.com ” its online gold jewellery house , because gold prices is daily change i want to change gold product price simultaneously in all gold product, but not the other price. for eg. my product is a gold ring with diamond. i just want to edit all product related gold or diamond price differently , not the club.

so please help me . i shall be very thankful to you.

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