Hello, you want to sell jewelry, don't you? I sell jewelry, and I graduated from jewelry. You can ask me any questions and I can answer them for you. In fact, the first point of jewelry sales, you need to know what kind of jewelry you are selling, diamonds or precious stones or jadeite. Different categories have different directions. For example, if you sell diamonds, you must have a clear understanding of diamond 4C, even if you are partially graded. But you must know clearly what the four C's of diamonds are, what they are and what you think. These must be understood. If it is jade or gold, you actually know what gold has and how to divide it. What do people think of you 18k? You can at least tell the guests that 18K is an expression of gold content. 18k is also the most commonly used. Hard enough to blend different colors, etc. You can find these yourself. Emerald is more complicated. If someone asks you casually what texture it is, you can't ask me ... at least you know what it is, and you don't need to know it separately, but you have a concept in your mind. Then you need to pay attention to some concerns of customers when buying. As a salesperson, you need to know this.