No one knows for sure where the messages came from, but they do know this: it started with a single diamond. The Koloa Diamond, found decades ago, was a peculiar cubic diamond, passed from collector to collector. It has always been a bit of a mystery. At least until 2021. Microscopic analysis of the diamond revealed two remarkable things: that it was manufactured (which was unheard of before the 1950's and certainly not at this...