2. China's national standard defines the optimization of gems as "all methods used to improve the appearance (color, cleanliness or special phenomena), durability or usability of jewelry and jade except cutting and polishing". Optimization processing can be further divided into two categories: enhancement and processing.
3. Optimization treatment refers to all methods used to improve the appearance, durability or performance of jewelry and jade except cutting and polishing, such as color, clarity, transparency, luster or special optical effects. It is divided into two categories: optimization and processing.
4. Optimization refers to various improvement methods to show the potential beauty of gems. Common optimization methods include heat treatment of all gems except jadeite, bleaching of all gems except jadeite, waxing of all gems except turquoise, chalcedony and agate dyeing.
5. All methods used to improve the appearance (color, cleanliness or special phenomenon), durability or usability of jewelry and jade are called optimization treatment, except cutting and polishing of jewelry and jade.