Thereby providing single crystal diamond particles excellent in thermal stability. The monocrystalline diamond particles contain cubic boron nitride particles. Preferably, the cubic boron nitride particles are present inside and / or on the surface of the cubic boron nitride particle-containing monocrystalline diamond particles, the average particle diameter of the monocrystalline diamond particles is 500 m or less, and the cubic boron nitride particles Has an average particle diameter of 0.05 to 100 m.
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