Layer style can be said to be Photoshop's special tool for texture. After targeted settings, the texture created can achieve realistic effects. It can also hide one or all effects, and can be stored, copied, or Paste it into other files. The Photoshop software itself also comes with many edited styles for users to use conveniently. Layer styles are suitable for creating textures in a wide range of applications, generally: smooth, rough erase, transparent and translucent, Add shadows, glow effects and many other effects to metal, plastic and other material objects.
First the shape of the pearl was made.
Add layer style, "Bevel & Emboss" option.
"Inner Glow" option.
Inner Shadow option.