1. Material: Jewelry can be made of various materials, such as gold, platinum, silver, diamonds and precious stones. Generally speaking, precious jewels such as gold and diamonds are considered high-grade.
2. Brand: Some well-known jewelry brands enjoy high reputation and brand recognition, so their product prices are usually higher. Some famous jewelry brands include Cartier, Tiffany and Bulgari.
3. Handwork and design: High-grade jewelry usually has unique design and exquisite craftsmanship. Handmade jewelry is usually more expensive than mass-produced jewelry.
4. Grading and evaluation: Diamonds and precious stones can be evaluated and graded according to their color, clarity, cut and carat number. Generally speaking, diamonds with high color, clarity and cut are considered high-grade.
It should be noted that the concept of grade in jewelry industry is subjective and flexible, and different people have different definitions of grade. Therefore, for different consumers, the definition of high-grade or low-grade jewelry may be different.