How many diamonds are found per month?

Since some diamond operations take place in secret, this number can only be an approximation. However, from the Research and Markets site, below, "About 130 million carats (26,000 kg) are mined annually, with a total value of nearly US$9 billion."

This includes all diamonds mined, about 80% of which are industrial diamonds, which are used by industry, except the gem industry.