Corundum gemstones such as rubies, sapphires, golden gems, black star stone and other quality. Due to the tripartite crystal system, due to the characteristics of lattice structure, when the vertical high-order symmetry axis L3 is cut and ground into a semi-spherical, there are six dazzling radial star-shaped rays around the L3 axis, shaped like a flash star, so it is called starlight stone. When light hits the surface of the gem, we can see two or three interlacing rays, sometimes even six. The light emitted by this light is as beautiful as the stars twinkling in the sky, and when the light source moves, the light on the gem's surface moves with it. This phenomenon is known in gemology as the astral effect of gemstones. The starlight effect refers to the phenomenon that the surface of the gem is polished into a curved surface, and the star-like light shows a confluence of tetrachedral, six-shot, twelve-shot and so on under the irradiation of light. According to the number of star-like rays, it can be divided into tetrachedral (cross), six-shot or twelve-shot starlight. There are three conditions necessary to produce the starlight effect:
1. Gemstones must be cut in curved shape;
2. The gemstone must contain two or more groups of directionally arranged fibrous inclusions or internal structures;
3. The underside of the curved stone must be parallel to the plane on which these inclusions or structures are located
Common starlight gemstone varieties on the market are starlight ruby, starlight sapphire, starlight hiblet stone, starlight garnet, starlight diopside, in addition to extremely rare starlight emerald, starlight spinel, starlight beryl (brown black), starlight moonstone, starlight Opal and so on.
It is worth collecting investors' attention that there are also synthetic starlight gems for sale on the market, mainly synthetic starlight rubies and synthetic starlight sapphires, and the identification characteristics of natural starlight rubies and natural starlight sapphires are as follows:
Natural star red, sapphire star line from the interior, the intersection of the star line has a widening and bright phenomenon, that is, the thickness of the star line is not consistent, the middle of the star line thick and thin, commonly known as "light and bright". The reason is that the development of internal inclusions is inconsistent, but the starlight behaves naturally and flexibly.
Synthetic starlight red, sapphire star line thickness uniform, star line intersection without widening and bright phenomenon, commonly known as "light without brilliance". Starlight floats on the surface, and starlight is stiff.
The quality evaluation of gemstones with starlight effect should be comprehensively considered from three main aspects: the quality of starline on the surface of gemstones, the color of gemstones and the internal defects of gemstones.
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Post time: Jun-26-2023