I have been asked to investigate how to make "a crystal stone the size of a tennis ball or a bit larger." low budget
"We need a crystal stone the size of a tennis ball or a bit larger. It can be any shape but it must have colour (real of illuminated)."
The reference has been given as a Copper Sulphate Crystal we are an a deadline for mid Feb so any help would be fantastic
I have added reference pictures also
All responses gratefully received