need help identifying these rocks/Gems, diamonds? Ruby, garnet, red diamond

[Haylow80]

ThisParticular mineral/rock was received from A estate sale. I am having a hard time identifying it is very hard and it looks like diamonds 😃

 

[DDancer]

Looks like Sphalerite, definitely has some high iron staining~ the rainbow iridescent stuff. Here's a link that might be of interest. https://www.minerals.net/mineral/sphalerite.aspx