Zhongxiang Jewelry, Le Dafu introduces you to
Sapphire The biggest feature is that it is uneven color, and you can see straight ribbons and growth patterns arranged in parallel six cylinders and different shades of the depth. The double crystals of the polyplate are developed, and the double crystal patterns of the blinds are common. The cracking mostly cracks along the double crystal plane. Strong dichroicity. So how to identify sapphire and blue stone?
What is blue stone
Blue stone is a blue glass or blue burning material. Before the Qing Dynasty, blue glass was also very expensive. The tops on the heads of third-rank officials are generally made of sapphire, but blue glass can also be used instead. Of course, in modern times, the value of this blue glass is far less than that of sapphire. In old jewelry, this kind of glass products often include a top, a Buddha's head, a body, a thought, a large pendant, a hat, a pot lid, etc. It is easy to distinguish from sapphire.
Color material stone color is clear but mostly impure.
Color shape The stone has uniform color without obvious color shape.
Specific gravity The specific gravity of sapphire is between 3.9-4.1, while the specific gravity of bluestone is about 2.6, so the weight in your hand is obviously distinguishable.
Hardness The hardness of sapphire is 9, with a high hardness. Generally, there are no scratches such as cow hair pattern , and the stone is about 5.5 degrees, and it is soft and often has traces of cow hair pattern.
Impurities The sandbags in sapphires are cotton-like and are not visible in material stones, while those with impure blue material stones can often see bubbles.
Factors affecting sapphire price
Saturation, saturation refers to the brightness of the color, also known as the purity of the color. The saturation depends on the ratio of the color-containing component and the achromatic component (gray) in the color. High-quality sapphires have high saturation of blue, and the human eye feels that blue is thick. On the contrary, the lighter the blue, the lower the value.
Brightness is the eye's feeling of the light and darkness of the light source and the surface of the object. It can also be understood as the brightness of the sapphire color. High-quality sapphires have bright blue color. Of course, the concentration of blue and the cutting of gemstones will have an impact on the brightness, but the value of dark sapphires is reduced.
Evenness, because the ribbons of sapphires are relatively common, the color of high-quality sapphires should be uniform. Most sapphires can be seen from the pavilion, but after cutting, the color should be uniform from the table. When observing sapphires vertically in the tabletop, if you can still clearly see the ribbons and spots, the quality will decrease.
Weight is an important element in evaluating sapphires: Currently, those who have 3 carats of perfect rubies in the world, and those who have 5 carats of sapphires are very rare. Perfect sapphires greater than 10 carats are more than 1 times the price of diamonds with the same weight. The larger the gem, the greater the price per carat. Therefore, when evaluating sapphire, you must pay attention to its weight.
Cutting: Sapphire has obvious dichroism. If it is not focused on its direction when cutting, it will seriously affect the color and charm of the sapphire, and it will not reflect the beauty and brightness of the sapphire, which will seriously affect their price. Generally speaking, sapphires are cut into standard, step and mixed styles.
