http://b4hntuy3fimfh2227vf4f74emnya7p35i5brtqujs6leqvtclfwvjbqd.onion/doc/physics/diamonds-crookes/The%20Project%20Gutenberg%20eBook%20of%20Diamonds,%20by%20William%20Crookes..html
In California authentic finds of diamonds
are recorded in Butte County, especially at [4] Cherokee, above Orville. These diamonds,
however, have come from alluvial deposits
and have been found generally in washing
for gold.