The size and refractive index of the crystals that constitute pearl essence are measured, and the relation between the luster of pearl essence and the optical properties of the crystal, namely reflection, transmission and scattering are studied.
The crystals are of (2/100_??_3/100mm)×(2_??_8μ) rectangles with 70_??_80 mμ in thickness.
The refractive index is 1.91>n>1.80.
Theoretical calculation shows that the thickness of the crystal is adequate to the condition for the pearl essence to give out the lust of pearls.
