How to tell if this is a saltwater Keshi or Freshwater?

bfgnum10

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Sep 22, 2025
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Little bit of background information. The pendant is custom made in the 1970s for my grandma in Vancouver Canada. It's set in 14 K Gold has gas a natural accent diamond. The Pearl is 17 mm by 7 mm by 5 mm deep. I've been told that's quite large and rare for a freshwater Keshi from the 70s so I'm wondering if it's Salt water
 

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I think it looks like a Biwa pearl, which would be freshwater.
 
I think it looks like a Biwa pearl, which would be freshwater.
Apologies, I hadn't realized I didn't click reply when I left a comment. Would this be an unusually large size for a genuine Biwa pearl from that time period?

I have so much trouble finding any comparables online. It's all Chinese stuff that uses the name biwa now. It seems almost impossible to find a historic biwa pearl from lake biwa.
 
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