Fire resistance, the light that enters the interior of a gem and reflects from the top of the gem through refraction, is called fire resistance. "Anti-fire" is a term in the jewelry industry. Terms used in colored gems? The way is to let the external light shine on the gem, and the light reflected inside the gem? The brighter the color, the larger the area and the better the fire color.

Jewelry has a broad sense and a narrow sense. Jewelry in a narrow sense refers to jade products. Broadly speaking, jewelry should include jewelry, handicrafts or other treasures made of gold, silver and natural materials (minerals, rocks, organisms, etc.). ) and has certain value. Therefore, there was a saying of "gold and silver jewelry" in ancient times to distinguish gold and silver from jewelry.

With the development of social economy, the concept of jewelry should be extended to include gold, silver and jewelry besides natural gems and artificial products. The industries involved in these terms are collectively referred to as "jewelry industry". The scope of "jewelry" is much larger than that of "gem" in a broad sense.

In a narrow sense, gems and jade are also different: gems refer to single mineral crystals with magnificent colors, crystal clear, hardness, durability and rarity, which can be polished into gem jewelry, including natural and synthetic, such as diamonds and sapphires; Jade is a mineral aggregate produced in nature, which is beautiful, durable, rare and has technological value, and a few are amorphous. Such as jadeite, nephrite, dushan jade and jade.