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The reason is called "semi-precious stones" because of its stripes, hardness, color, transparency, durability, rarity, crystal morphology and degree of market acceptance of recognition, are different from other minerals, so it has a special ornamental decorative purposes. With different precious stones In addition, the higher the output of semi-precious stones, Pearls jewelry and diamonds, it is not as expensive.
Different sources of semi-precious stones, various gems sales on the source of most of the semi-precious stones can be divided into three categories: natural extraction, processing, synthetic.
1, natural exploitation: such as amethyst, white crystal and agate, because the origin and output, so it rarely counterfeiting situation. Made into gemstone jewelry.
2, processing and semi-precious stones: because of some natural semi-precious varieties yield less, but the chemical composition and yield was more than very close, and from there the body in the production of multi-processing, so that its composition changes to become a low production of semi-precious stones . Contains iron ions, such as amethyst, if heated to high temperatures over 500 degrees Celsius, has become scarce iron containing yellow crystals. Most of the yellow crystal jewelry on the market is by way of this internal chemical changes produced.
3, synthetic semi-precious stones: Science and technology is highly developed today, advanced laboratory techniques is now able to mimic the formation of some semi-precious stones environment, monitored by the case method to accelerate the formation of crystalline semi-precious stones. In fact, the technology and science in the crystallization process is very similar, but uses a high concentration of aqueous solution, dissolved salt, or mist, and then slowly crystallized under high temperature into larger crystals. This synthetic semi-precious stones in the physical properties and chemical composition structure of the same species, and natural precious stones is almost no difference, and some even more perfect than the natural. Unless specific tests, or the naked eye it is difficult to distinguish the two.
The color of semi-precious stones and precious stones in general are slightly different, as is a family of white quartz crystal, amethyst earrings and rose quartz, because of containing different types of compounds or ions of different colors, they will reflect a different color. But this theory does not explain the different semi-precious stones hundred percent of the same color. Such as fluorite is calcium fluoride, but there are two colors purple and green, rather than transparent or white. In addition, because the proportion of the different components inside, there may be a different color and patterns appear in the same piece of semi-precious stones on.