http://b4hntuy3fimfh2227vf4f74emnya7p35i5brtqujs6leqvtclfwvjbqd.onion/doc/physics/diamonds-crookes/The%20Project%20Gutenberg%20eBook%20of%20Diamonds,%20by%20William%20Crookes..html
In a lecture “On Diamonds,” fifty years
ago, [1] Professor Maskelyne said, “The diamond [2] is a substance which transcends all
others in certain properties to which it
is indebted for its usefulness in the arts
and its beauty as an ornament.