The depression of the 1930s hit the ideal cut diamonds trade hard. The cutting shops were sometimes shut down completely for several weeks at a time. The situation remained difficult until the outbreak of the Second World War.
Conflict engagement rings are diamond dealers that originate from areas controlled by factions opposed to internationally recognized governments such as Liberia, Sierra Leone, and Angola.
Some fancy diamonds are composed of carbon, that is recycled organic matter, previously incorporated in marine organisms.