The uncut Matan diamond weighed 367 carats, the largest gem-quality rough diamond ever discovered in Kalimantan, Indonesia- Reference Database -Internet Stones.COM
The Matan diamond gets its name from the Pangeran (ruler) of Matan, in whose territory in western Kalimantan (Borneo), the diamond was discovered in 1787, in the famous Landak mines, which was one of the oldest and most productive mines in the world. The diamond had remained in the Pangeran’s family ever since it was discovered
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[Source: Diamonds, Gemstones & Mineralogy Resource-Internet Stones.COM]