Natural sapphires belong to the corundum mineral group and are one of the highly cherished gemstones.

In terms of color display, their hues are rich and diverse, covering a range from light and pale blue to deep indigo. Among them, Cornflower Blue and Royal Blue are the most famous and rare. The formation of sapphire's color is related to elements such as iron and titanium contained within. The content and distribution of these elements directly affect the depth and tone of the color.

Regarding hardness, the Mohs hardness of sapphires also reaches 9, possessing excellent wear resistance and long-lasting durability. The high hardness makes it equally necessary to have superb craftsmanship and specific tools during processing and setting.

In terms of transparency, high-quality natural sapphires usually have good transparency and are relatively pure inside. However, most sapphires will also have certain inclusions and fractures and other features. The types, sizes and distributions of these inclusions can sometimes be the basis for judging the origin and quality of sapphires.

In terms of luster presentation, it shows a strong glass luster or even subadamantine luster, shining and dazzling under the illumination of light.

From the perspective of optical characteristics, sapphires have obvious dichroism. When observed from different directions, subtle differences in color tones can be detected. In addition, some sapphires also have a unique star effect, making them even more unique and charming.

In terms of physical properties, sapphires have a large density, a high specific gravity, and good thermal conductivity and electrical conductivity.

Due to their rarity and preciousness, charming colors, excellent physical characteristics and unique optical performances, natural sapphires are deeply loved and valued in the jewelry market.