Charlotte Tilbury Air Brush FlawLess Foundation stay all day and night30 ml Step 1: Identify Your Undertone Cool undertone Skin has hints of pink, red, or blue. Veins look bluish purple. Silver jewelry usually looks better than gold. You might burn more easily in the sun. Warm undertone Skin has hints of yellow, golden, or peach. Veins look greenish. Gold jewelry flatters more. You tan more easily. Neutral undertone A balance of both. Your skin doesnt look overly pink or yellow. Both silver and gold jewelry suit you.