The refractive index of colloidal particles formed by nanodiamond in water (average diameters of 106, 122, and 854 nm) was measured by Fabry-Perot interferometry as n = 1.78, 1.74, and 1.79, respectively, which suggests the molar ratio of water to carbon within these particles of 0.16:1, and the effective thickness of interfacial (nano) water shells around a 5 nm diamond particle of 0.48(5) nm. Structural implications of this are discussed.

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