Also, your titles. Describe your item in the first three words. EG.
Quartz earrings
Then expand.
Quartz earrings Gold filled gemstone jewelry
Use two-word tags that are relevant. For example "Gold earrings" instead of "gold" and "earrings"
It's unlikely you'll show up in search for someone searching for "gold" or "earrings", and you won't find many buyers if everyone finds your items through 'earrings'
However if someone searched 'gold earrings' then your item is relevant to what the buyer is looking for in their search.