Black heart / dagger ring

This ring appears to be an onyx or onyx-like gem shaped like a heart with a dagger running vertically through it. The heart has some lined detail all around it as you can see in the photos and the round part appears to be a metal material. This ring is in perfect condition and has never been worn except for the photo, however there are some faded stains on it as it is some metal material. This fits a ring size 9. / 7 cm / 2.4 inches.