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Diamonds in Sudan Meteorite 'Are Remnants of Lost Planet' (theguardian.com)
Diamonds found in a meteorite that exploded over the Nubian desert in Sudan a decade ago were formed deep inside a "lost planet" that once circled the sun in the early solar system, scientists say. From a report: Microscopic analyses of the meteorite's tiny diamonds revealed they contain compounds that are produced under intense pressure, suggesting the diamonds formed far beneath the surface of a planet. In this case, the mysterious world was calculated to be somewhere between Mercury and Mars in size. Astronomers have long hypothesised that dozens of fledgling planets, ranging in size from the moon to Mars, formed in the first 10m years of the solar system and were broken apart and repackaged in violent collisions that ultimately created the terrestrial planets that orbit the sun today.
According to TFA, these diamonds contain an iron-sulphur compound that forms at 20 gigapascals. Regular diamonds can form at 3.5-4.5 gigapascals.
If you read the article, it mentions that the diamonds are up to 100 micrometers across. Human hair diameter ranges from 17 to 181 micrometers, so these diamonds are roughly as big across as the thickness of a human hair. What they're describing is more appropriately used for industrial abrasive than as gems.