1.** Chinese national standards * *: China has formulated a set of national standards for jade identification, the most important of which is the Jade Identification Standard (GB/T 16552-2020). This standard includes the evaluation criteria of jade texture, color, transparency, texture and hardness, as well as the identification methods of different varieties.
2.** International standards * *: There are also some standards in the international jewelry and gem industry. For example, institutions such as the International Gemological Society (IGI) and the International Gemological Association (GIA) have formulated some standards for jadeite identification and classification. These standards usually cover more aspects of gemology, including texture, color, clarity, cutting and so on.
3.** Local standards * *: Some countries or regions may formulate their own jadeite appraisal standards to meet the needs and characteristics of the local market. These local standards may be slightly different from national or international standards.
Emerald is a precious gem, and its value depends on many factors, including color, texture, transparency, origin and so on. Therefore, accurate jade identification is very important for jewelry industry and collectors. If it is necessary to identify jadeite jade, it is recommended to cooperate with professional jewelry appraisal institutions or appraisers, who will generally identify according to relevant national or international standards.