noun
pearl color; pearly white; pearl grey
A pale, lustrous off-white or light grey with a subtle sheen, like a pearl. Used as a color name in fashion, design, and description.
彼女は真珠色のドレスを着ていた。
She wore a pearl-colored dress.
壁は真珠色に塗られていて、部屋が明るく見える。
The walls are painted pearl white, making the room look bright.
灰色 is a neutral grey, whereas 真珠色 can be a grey with a pearly luster, often lighter and more elegant.
Compound of 真珠 (pearl) + 色 (color), literally 'pearl color'.