Sapphire is one of the most expensive minerals in the world. The name “sapphire” comes from the Greek sappheiros – “blue stone”. However, a similar word existed in the Hebrew and Persian languages. It is possible that the original source was Sanskrit. Like other blue jewelry stones, it is considered to be an “air stone” and personifies the sky.
A good blue sapphire must be dense and heavy, transparent, shiny (with an inner shine) and well-cut. The color of the ideal stone “resembles the color of the neck of a peacock or cornflowers”. Sapphires are blue, however, there are some more rare sapphires of other colors.