1. Observe the color of the blood vessels on the inner side of the wrist: If the blood vessels appear blue or purple, it belongs to cold toned skin; If the blood vessels appear green, it belongs to warm toned skin.
2. Judging the reaction of the wrist to gold and silver: Wearing gold jewelry is more elegant, usually with warm toned skin; Wearing silver jewelry enhances one's temperament, usually with cool toned skin.
3. Observe the skin tone of the wrist under natural light: yellowish or easily sunburned, usually warm toned skin; Pink or pale, usually with cold toned skin.