To determine your skin tone, look at the veins on your wrist. If your veins appear blue, you likely have a cool skin tone. If your veins appear green, you likely have a warm skin tone. If your veins appear blue-green or purple, you likely have a neutral skin tone. Choose The Right Shade Of Aquamarine Once you have determined your skin tone, choose an aquamarine gemstone in a shade that complements it. For cool skin tones, choose an aquamarine ring with a blue-green hue. For warm skin tones, choose an aquamarine with a greenish-blue hue. For neutral skin tones, choose an aquamarine with a balanced blend of blue and green hues. When choosing a perfect aquamarine for your skin tone, you should not rely on just one type of lighting condition. Match aquamarine with your skin under different lighting conditions.