Can you share a photo of the piece with a $7500 price tag? I saw your other thread too and don't see anything with that number on it.
I do see some numbers on the tags, but they don't correlate to the pearls. The snippet below, for example, shows 7150 for small, side-drilled Biwa sticks. These are worth maybe $20 to $50 per strand wholesale in the states.
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I agree that the lot would make the most sense for crafting and beading. If the pearls were finished into jewelry, they could be sold individually.
Based on the age of the tags, the 3/4 pearls, the Biwas (which haven't been grown commercially for a very long time), and the company names, these aren't recently marketed pearls. They're not the sort of pearls an active dealer would have today either, unless they discovered a box of odds and ends in their vault from a few decades prior. That does happen. Sarah (Kojima) had several hanks of old Biwa pearls in Tucson last month. She said they found them in an old safe that hadn't been opened in decades.
I wish I had better news for you, but I am giving you a qualified and honest assessment of what you have.