First， Choose a reputable company. Ask what the ingredients of the scarf are. There are some wool and cashmere blend scarves also called cashmere scarf. If you want to 100% cashmere scarf, please check the component label first.
Second, The cashmere scarf is super soft and smoothness. Other scarves either imitate their softness or their smoothness, but can not imitate both two characters. Just touch and try on to see if you have both of these characteristics.
Third, You can also wear a scarf around your neck, and use your scarf Rub with your neck over and over again because the neck is sensitive. If you feel tingling, it must not be a cashmere scarf.
I hope this article would help you.