Gemstone treatment is not a new thing in gemstone business, the essence is to improve the “appearance, durability or value” of the gemstone. We can say gemstone treatment is any human controlled process that has the purpose to improve the appearance, durability or the value of the gemstone.
Take note here, cutting and polished of the gemstone is human controlled process, but is not treatment process.
It is also good to know different types of treatments, simply because gemstones differ in treatment due to their nature. Some of the gemstones cannot be treated at all or we can say the scientists have not yet discovered the method of treat them.
That is to say treatment is very important, for instance it’s common to treat Tanzanite by heat. By doing so, you may get blue or violet colors seen clearly, which will make it more attractive.