You mean this:

1. Generally, under the magnifying glass, three groups of closely arranged filamentous rutile inclusions of 60 degrees and 120 degrees can be seen.

2. There is a bright spot in the center where the three star lines intersect, and the star lines gradually taper from the center to the edge (this is the most intuitive difference from synthetic star sapphire).

3. Because the bottom surface of natural starlight sapphire has not been polished, flat or angular band-shaped and stepped cleavage planes can be seen.

Synthetic starlight sapphire (fake starlight sapphire):

1. Even in indoor lighting conditions, the star line is clear.

2. There is no bright spot at the intersection of stars and lines.

3. The step cleavage of natural starlight sapphire is not visible on the bottom, but the obvious arc growth line.

This is a ruby:

Ruby is one of the precious varieties in jewelry. Ruby is bright in color, and under the illumination of light source, it can reflect beautiful and moving six-ray starlight, commonly known as six lines, which is caused by the special crystal structure of ruby and its unique optical phenomenon. Ruby is transparent, translucent and opaque, and its colors are water red, pink, pigeon blood red and rose red. Natural ruby crystal is hexagonal or hexagonal bipyramid, so its color is generally cobweb concentric hexagon. "∧" or "-"shape may also appear after cutting. Put the gem into clear water, and its above color and shape will be clearly displayed. Ruby has a specific gravity of 3.99~4.02 and a hardness of 9. Ruby with large particles, pure texture, no cotton and no frills is very precious and rare. In this respect, rubies with large particles are usually fake. There are two kinds of fake rubies: the first is to pass off low-grade rubies as rubies, such as big rubies, ruby, garnet and so on. The way to distinguish between true and false rubies is to observe their colors. The red color of ruby is brilliant red, bright and dazzling, the red color of big ruby is deep red, the red color of ruby is pink, and the red color of garnet is purplish red. Moreover, all fake rubies do not have the unique color, shape and luster of rubies. The second is to be a ruby. Artificial ruby is very similar to natural ruby in terms of specific gravity, hardness and color. The method of identification is to put gems into water. The color of natural gems is "∧" or "-"or concentric hexagon, while the color of artificial rubies is cylinder or concentric circle. Intuitively, artificial rubies have uniform texture, no natural impurities, even and positive color, often large particles and lack naturalness.

The difference between natural ruby and synthetic ruby;

1. contains methods.

There are many methods to synthesize ruby artificially, mainly including flame melting method, flux method and hydrothermal method. Ruby synthesized by different methods has different inclusions, which need to be distinguished in professional laboratories. We only need to identify whether they are natural or synthetic, and we don't need to find a synthetic method. Synthetic rubies are also characterized by bright and uniform colors, and it is difficult to find inclusions with naked eyes. However, most natural rubies on the market have obvious defects more or less.

2. Fluorescence method

Natural rubies with difficult to find obvious inclusions can be distinguished from synthetic rubies by long-wave ultraviolet lamps (ordinary portable money detectors). Experiments show that both natural ruby and synthetic ruby emit red light under long-wave ultraviolet lamp, but synthetic ruby is brighter and richer in color.

Natural gemstones have "ten Hong Jiu cracks", and natural rubies without any flaws and cracks are extremely rare. Artificial rubies have the same color, few internal defects or crystal inclusions, and are clean and large. As a precious gem, natural rubies over 3 carats are very rare in the market. If you encounter a big ruby, you should pay attention, because the value of natural ruby is thousands of times higher than that of artificial ruby. A little carelessness will "take medicine."

Natural ruby has a strong "dichroism". The so-called dichroism means that there are two colors of red and orange red from different directions. If there is only one color, it may be red spinel, garnet or red glass.

Red spinel and natural ruby are very similar, and they are most easily confused, so be very careful.