In response to @jmj378 who posted here:
I would like to know how we can get Ebay to create a special filter so folks can know items are from USA/ America. Americans need to keep the US economy alive. At least give us a choice, a chance.
This filter already exists, but listings will only appear when sellers fill out the item specifics field. Since you originally presented your post on a discussion about fine jewelry, these screenshots were taken from a search in the fine jewelry category.
Scroll down to the bottom of the filters on the left side of the page and click on more filters.

The left side of the pop-up shows more filter options including country/region of manufacture. Select United States and apply the filter to your search results.

If the item is not manufactured in the USA but you simply want to search for sellers shipping from the USA then you can use this filter found on the left side of the page:

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