Since the discovery of sapphire in the late 1980s, Changle has relied on its rich sapphire resource advantages, preferential industrial policies and perfect supporting services. After more than 20 years of development, the jewelry industry has grown from scratch to small and large. Single sapphire processing to the development of various types of jewelry design and development, processing and manufacturing. At present, a relatively complete jewelry industry chain has been formed, which plays an important role in the country.
Sapphire is the city card of Changle. The gold and jewellery industry is a characteristic industry of Changle. It has formed a cluster of jewellery characteristic industries with sapphire and gold processing transactions as the leading. According to Changle's planning for the jewelry industry, we will strive to use the three to five years to continuously expand the scale of the jewelry industry, lengthen the industrial chain, and strive to promote the development of large-scale and high-end gold jewelry industry, and continuously improve the level of internationalization until 2018. To achieve the goal of gold jewelry processing and trading of 100 billion jewellery industry, and form a market trade pattern of “Southern Shenzhen, Beichangle†and “Buy Global and Sell Globalâ€.
Advantages of Changle Sapphire
The crystal granules are super large. The sapphire crystals formed by the Changle sapphire deposit are formed by volcanic eruptions with deep eruption source, high eruption intensity and large ejection, and around the discharge port without geological handling. The particles are oversized, accounting for about 10% of the 10 carats.
Good quality, high wool yield, world sapphire wool yield is about 20%, and Changle sapphire wool is as high as 50% or even 80%.
The pure color and bright Changle sapphire has another great advantage: pure color, high purity and strong dichroism. This is because the Changle sapphire ore-bearing rock (basalt) is more ultra-basic, iron, chromium and nickel in the rock. The high content of cobalt and strontium makes the color of sapphire very pure and vivid.
A variety of best types have produced the world's recognized best-selling sapphire varieties such as cornflower color and card blue.
Unique special gemstones In addition to the world-recognized best-quality sapphire, Changle also produces a large number of precious colorful sapphires, such as the semi-yellow and semi-blue embers unique to the world. In addition, some of the Changle sapphire contains strange inclusions, which produce a strange light effect, forming a variety of beautiful patterns.
The two types of star gems coexist with sapphire after a moderate processing to become a six-shot star sapphire. Although Changle is not the only place where starlight sapphire is produced, it produces two starlight gemstones, copper starlight and blue starlight, in one mine, which is unique in the world.
Classification of Changle Sapphire
According to the quality of wool, Changle Sapphire can be divided into 6 types, including:
The sapphire wool of the best sapphire is mined, and without any artificial color change and optimization, the quality can reach the world-recognized sapphire standard of the best type, such as cornflower color, card blue and so on. Such gemstones produce less than 0.5%;
Sapphire such as sapphire is a unique type of Changle, divided into three series: amber sapphire, colorful sapphire, and patterned sapphire;
Starlight sapphire contains special wraps inside to create a live light effect. There are three series of copper starlight, blue starlight and cat's eye starlight;
Ordinary sapphire single crystal sapphire is called ordinary sapphire;
There is also a mixture of gemstone and corundum and pure corundum.
Classification and quality evaluation of Changle sapphire
According to the actual situation of the production of Changle sapphire and the general practice of the market, Changle has established its own classification and quality evaluation standards.
The best sapphire has not been color-changed and manually optimized, and Changle has been graded and evaluated according to international standards.
Ordinary sapphire is graded and evaluated according to the following principles in accordance with international general standards:
1. Color: Because it is a colored gemstone, color is the most important factor in its quality evaluation, accounting for 60% of the total evaluation factor of gemstones, (natural products), 25%, (artificial color change products). The order of classification is: cornflower blue (optimal), rich blue (excellent), fresh blue (good), light blue (middle), extremely pale blue or blue with gray, green (poor).
2. Weight: The greater the weight, the better, accounting for 25% of the total evaluation factor of the gemstone (artificial color change), 60% (natural product).
3. Transparency and clarity: The more transparent the better, divided by the benign oriented inclusions that produce the star color effect, the less the other bad inclusions and the cracks and cracks, the smaller the better. It accounts for 15% of the total evaluation factor of gemstones.
4. Cut: Those with high transparency should be cut into facets. Those with low transparency but star effect should be cut into curved faces. It accounts for 10% of the total evaluation factor of the main stone.
Starlight sapphire. Grading and quality evaluation according to the following criteria:
1. Excellent level: the transparency is very high, the starlight is very bright, the intersection of the star line is at the apex of the gemstone arc, the star line is not broken, no bending.
2. Good grade: high transparency, a small amount of impurities, starlight, star vertices near the apex of the gemstone arc, the star line is straight, no break.
3. General level: the transparency is not high, there are impurities, the starlight is brighter, the intersection of the star line deviates from the apex of the gemstone arc, the inner line is curved, and there is a defect.
Singular sapphire, grading and quality evaluation criteria:
The singular gemstones are characterized by strangeness, difference, independence and beauty. They are rare species in the world and are unique in China. It is difficult to make an exact estimate. The commonly used evaluation principle is a corundum gemstone that must be natural and has a unique picture or bright color. It has the following five characteristics: naturalness, aesthetics, specificity, authenticity, and rarity.
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