HELP! Tiffany open heart pendant

I have a necklace that's not part of the peretti collection, the style of the heart lays flat and is unique, I can't find it anywhere on the internet, the chain placement isn't the same as the Peretti design, I was wondering if anyone has got the same necklace? or knows what collection it's from? It was a gift from my cousin and she got it as a gift from her aunt, my cousin hates silver so it was given to me, I'd just like to know what I have, I got an estimate at a jewelry shop, but because of the weight of the silver I was estimated only $15. I'm wondering if I have a unique piece of a Tiffany collection? Maybe an original piece? View attachment 4196106