He is an expert in gemology, and he is good at evaluating the quality of diamonds.

This gem is made of cinnabar.

Akamiko is my best friend.

Akemi is my best friend.

This painting is characterized by its vermilion spots.

He reviewed the manuscript and made corrections where necessary.

The color scheme of this painting is mainly blackish red, giving a sense of depth and strength.

His painting has beautiful red and green hues.

The torii gate of this shrine is painted in red, and it's very beautiful.

This red sand is very beautiful in color.