Look at the shape According to my understanding of Longjing tea, Longjing tea below 1500 is generally not very good-looking, and it is basically one bud and two leaves. If the tea you buy is beautiful, with one bud and one leaf, it may not be the new tea of that year, or it may not be the West Lake Longjing (there are many Longjing, which is planted in many places in Zhejiang). The real West Lake Longjing tea, with one bud and one leaf, looks good, and there is basically no tea below 2500.
Smell the fragrance. West Lake Longjing is mostly bean-flavored. After heating the cup and adding tea, you can smell the unique aroma of orchid beans. Longjing in other places may look similar to Longjing in West Lake, but there are still some differences in taste.
I hope the above will help you.