There is a clue you can use to determine your undertone, because it's not always immediately apparent. look at your wrist If your veins shine bluish through your skin, you most likely have a cool undertone. If they appear greenish, it's probably warm and if you can't pinpoint it, your undertone is probably neutral.
Furthermore, the choice of jewelry goes hand in hand with the undertone. If gold jewelry suits you better than silver jewelry, your undertone tends to be warm. And silver suits you better, you're rather cool. If both look gorgeous on you, you're a neutral guy.
But these are only indications. I can say from personal experience that this is not always true. I have cool, neutral and warm undertones in my foundations. Because, to make the choice of color even more complicated, the warmth and coolness in the foundations varied depending on the manufacturer and the product. The only thing that helps: try it out!
