Why are rubies red and emeralds green? Their colors come from the same metal in their atomic structure
The colors of rubies and emeralds are so striking that they define shades of red and green – ruby red and emerald green. But ...
Hackaday4y
A Quick And Easy Recipe For Synthetic Rubies
deep pink ruby. This looks like a fun, quick little project to try sometime. We wonder if the method can be refined to create the guts of a ruby laser, or if perhaps it can be used to create ...