1, different mass
Ruby is a natural gem with many cracks and inclusions, so the crystal grain of ruby is relatively small, and high-quality ruby is very rare. Unfired ruby is unheated ruby, and its quality is very good, but the quality of fired ruby is not very good, so firing is used to improve the quality of ruby.
2, the price is different
Unburned rubies are more expensive than burned rubies.
3, whether it is accepted by the industry and consumers.
Unburned gemstones are easily recognized and accepted by the industry and consumers. Ruby burning occurs. If other substances are added or heated, there will be substances left in the gem seam, which is not recognized and accepted by the industry and consumers.
Comparison of ruby burning and not burning
Simply put, the so-called firing is to improve the quality of gems by heating and optimizing treatment. In fact, the natural formation of gems is a burning process. Except for diamonds and olivine, other gem minerals are formed in the earth's crust, and become gems after being heated at high temperature and high pressure in the depths of nature.
The heat treatment is to put that gem with poor quality into a heating device, simulate the heating condition infinitely close to the natural environment, and heat the gem, so that the color, transparency and purity of the gem can be improved stably for a long time. However, the optimization of heat treatment is not foolproof, and sometimes heating will burn out gems.
Heat treatment is the most commonly used optimization method for ruby and sapphire. There is a burning sensation after heat treatment, and there is no burning sensation without heat treatment. Ruby and sapphire will become more bright, beautiful and transparent after heat treatment, and there is room for collection and appreciation. In the jewelry industry, rubies and sapphires after heat treatment can also be identified as natural gems.