Millions of jewels are not all customized. Jewelry has a broad sense and a narrow sense. Jewelry in a narrow sense refers to jade products. Jewelry in a broad sense should include jewelry, handicrafts or other treasures made of gold, silver and natural materials (minerals, rocks, organisms, etc.). ) 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 society and economy, in addition to natural gemstones and artificial products, the concept of jewelry should be expanded to include gold, silver and jewelry. The industries that handle these items are collectively called "jewelry industry", and the scope of "jewelry" is much larger than the broad concept of "gem", which refers to those raw materials suitable for polishing or carving into jewelry or handicrafts.

If a gem is not beautiful, it can't be a gem. This kind of beauty is either colorful, transparent and clean, or has special optical effects such as cat's eye, discoloration and night light, or has special patterns such as chrysanthemum stone, agate and plum blossom jade.

For example, diamonds with few defects can be polished into precious diamonds, while those with poor transparency, many defects and black color can only be used as industrial raw materials.