This is what I found so far:View attachment 5960112
My three pieces, both bracelets were bought pre-loved on eBay and the charm was gifted to me recently. I actually wear the charm clipped to non-branded silver chain necklace.
The bracelets confuse me. The top bracelet, my more recent purchase, the links are about 10mm, while the heart clasp bracelet (my first) are closer to 14mm. I hadn't realized the variation in the sizing and surely thought at least one of them was fake because of it.
I do prefer the larger link size of the heart clasp bracelet, but know nothing about it at all. I was hoping to post it here and find more information about it (name, what year it was released, etc).
I contacted T&Co. about the piece and the sizes and they said it was a retired style, and all of the current bracelets are approximately 10mm. I plan on getting the matching choker necklace with the heart clasp, but all the listings I see, the links are smaller and closer to 10mm so they don't quite match the bracelet I already own.

Tiffany & Co. Heart Clasp Round Link Chain Choker Necklace Silver 925 W/Pouch | eBay
Find many great new & used options and get the best deals for Tiffany & Co. Heart Clasp Round Link Chain Choker Necklace Silver 925 W/Pouch at the best online prices at eBay! Free shipping for many products!
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Tiffany & Co. Heart Clasp Round Link Choker Necklace Ster. Silver w/ Box & Bag | eBay
Find many great new & used options and get the best deals for Tiffany & Co. Heart Clasp Round Link Choker Necklace Ster. Silver w/ Box & Bag at the best online prices at eBay! Free shipping for many products!
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The second link looks like it has a bigger chain link size.