That's a sweet way to memorialize your cat. Would love to see pic. I own three down from five.
I'm not sure how getting links into posts on PC works but...these ball studs from Amazon come in silver, yellow and rose gold and I've bought several 3 mm pairs of each. If I lose one it's nothing significant.
Bead Ball Earrings in Sterling Silver
https://www.amazon.com/dp/B0055H14NK..._tDd0ub1MD9AV2