As more and more people like gems, the market for rubies and sapphires is selling well, bringing a new round of gem storms. Many people still don't know much about gems, and together with Xiaobian, they can understand synthetic rubies, sapphires and their identification.
A flame fusion method:
1. Original crystal form: The natural product has a barrel shape, a column shape, a plate shape crystal form, the crystal face is horizontally developed, and the crack is developed perpendicular to the c-axis, so the fracture is stepped, and some samples have a hard molten shell.
The original crystal form of the flame-melting synthetic product is pear-shaped: sometimes it is artificially broken and rounded for impersonation of natural products, but it is not cracked, so there is no step-like fracture, but a shell-like fracture.
2. Color:
The color of the early flame fusion method is too pure and too bright, giving people an unreal feeling. But with the continuous improvement of the production process, this feeling can only be used as a warning, not a basis for identification.
gem
3. Polychromaticity:
The mesa orientation of natural products is generally perpendicular to the C-axis. When viewed from the countertop with a dichroic mirror, it is not obvious that dichroism or dichroism is not obvious. The pear crystals of the flame fusion method often crack in the C-axis direction due to stress, and in order to make full use of the raw materials, the mesa orientation is parallel to the C-axis, and obvious dichroism can be seen from the stage. Therefore, when an abnormality occurs in the dichroism observation, it should be alert.
4. Luminescence:
The natural ruby ​​and flame fusion synthetic ruby ​​can emit red fluorescence under the illumination of ultraviolet light source, but the fluorescent effect of natural products is weaker than that of synthetic products. Natural sapphire often exhibits inertness under ultraviolet light, while flame fusion synthetic sapphire has more luminescence: colorless varieties can have light blue fluorescence under short-wave ultraviolet light: green varieties can have orange fluorescence under long-wave ultraviolet light; The blue variety may have a light blue-white or light green fluorescence under short-wave ultraviolet light.
Gem pleochroism
5. Absorption spectrum:
The natural ruby ​​and flame fusion synthetic ruby ​​have the same visible light absorption spectrum, but the absorption intensity of natural products is weaker than that of synthetic products. The visible spectrum of blue, green, and yellow varieties in natural sapphire can show the absorption lines of three irons in whole or in part, of which 450nm is the strongest, while flame fusion synthetic sapphire may lack these absorption lines or the absorption line is weak and fuzzy. .
Gemstone spectrum
6. Growth pattern:
Natural rubies and sapphires often develop flat growth strips around the C axis, and the growth belts in different directions are regularly intersected at a certain angle. However, only curved curved growth lines can be seen in the flame melting synthetic product, which is an important basis for the identification of flame melting synthetic products. However, as the production process is improved or reheated, the bending characteristics of the growth lines are increasingly difficult to observe.
Gemstone growth
7. Bubbles:
Bubbles are another important basis for the identification of flame-melted composites. Although the bubble is small, since the refractive index differs greatly from the refractive index of ruby ​​and sapphire, it has a relatively obvious outline and is easy to observe. The bubbles are generally spherical and can be sporadic, or banded and cloud-like throughout the sample.
8. Synthetic Starlight Variety:
Its star line is only on the surface of the gemstone. The star line is complete and clear, and the star line is thin. Bubbles and curved growth lines are also visible. The star line of the natural starlight species is produced inside the sample, and the star line may be missing, incomplete, and the star line is thick.
Synthetic starlight variety
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