Sorry for the photo quality, I had to dig through photos and then crop and blow up an old photo

I am looking for a necklace that was a college graduation gift from my mentor that was left behind when I left a DV relationship

Description- gold pendant with a koi fish engraved on both sides. Fish are facing opposite directions, so if you flipped the pendant they would be in a Yin Yang position to each other. Pendant is roughly the size of a quarter

I have searched for years but cannot find anything similar and it holds so much sentimental value, I would really like to replace it