According to relevant ancient books, the earliest large-scale colored diamond in the world was mostly produced in India. In ancient Indian diamond mining areas, there have been many famous world-class colored diamond diamonds, such as blue hope diamond, pink great mogul diamond diamond, Dresden green diamond, Taifini yellow diamond and so on. A few days ago, most of this colored diamond was embedded in the royal families of some countries in Europe and Asia, some in crowns and some in scepters, which became a symbol of wealth and power, and even more rare for ordinary people.
Colored diamonds have also been found in diamond producing areas in northern China. According to the "Linyi County Records" written as early as 19 17, "diamonds are clear as water and colorless, while those with four colors of white, yellow, red and green are used for jewelry, and those with small ones can be scraped with glass, which is often unavailable." It shows that colored diamonds were discovered in China as early as 100 years ago and used as "treasures".
In recent ten years, colored diamond's exhibition and auction successfully attracted a large number of customers at jewelry fairs held in Europe and America, which played an important role in activating the towel market and promoting jewelry sales. So as to show colored diamond to the audience, unveil the mysterious veil of colored diamond, which is extremely rare and expensive, give ordinary consumers a chance to see the noble face of colored diamond, and stimulate people's stronger interest and hobby in jewelry.
For colorless diamonds, people regard the yellowish color in colorless diamonds as the main factor of diamond degradation. Therefore, in the evaluation of colorless diamonds, China implements the evaluation standard of 100 color scale, which is called "Baise grade". "Water-purifying diamond", flawless, transparent as water, without any yellow and other miscellaneous tones, is classified as 100, which is the best among colorless diamonds. Pale yellow diamonds, which are difficult to observe with the naked eye, are classified as 99-95 colors, and these diamonds are also the best among colorless diamonds. When the color level reaches 94-75, the yellow tone contained in the diamond can be detected by the naked eye. The lower the color level, the more obvious the yellow tone is. Diamonds under 75 colors are easy to see with the naked eye. Unless they are turned yellow, they can no longer be used as gems.
Among the colorless diamonds, there is also a kind of crystal clear and water-transparent diamond, which can feel a pure light blue with the naked eye. This kind of diamond is called "fire and water diamond" and it is also the best among colorless diamonds.
Most natural diamonds contain different kinds of pigments. Generally speaking, pigments have a great influence on evaluating the quality of colorless diamonds, such as impure blue or yellow, brown, etc., which are all important factors to degrade colorless diamonds. However, when a diamond has pure and obvious color, it does not belong to the category of "colorless diamond", especially when it has red, dark blue, pink, rose red, golden yellow, green and other colors, it belongs to a rare colored diamond. Colored diamonds known a few days ago can be divided into the following categories according to their colors:
First, red diamonds: red diamonds are divided into blood diamonds and purple diamonds according to color. Blood diamonds are as bright as blood, gorgeous and incomparable, which are extremely precious and rare in colored diamond. 1989 In the spring, a 2.23-carat blood diamond named "Laqi" was exhibited at a jewelry fair in Paris, with a bid of $42 million. The beauty of "Laqi" is fascinating, and its expensive price is staggering. Compared with the price of gold at that time, it was more than100000 times of gold and more than 2000 times more expensive than colorless diamonds. "Laqi" blood diamond originated in Gorgonda, an ancient Indian diamond mining area, which means "great wealth". Judging from its mass production, it has a history of nearly 500 years.
1April, 987, one weighing 0. 95 carats were sold at a jewelry auction in the United States for $880,000, and other expenses were nearly $950,000, which set a record for purple diamonds per carat/kloc-0.0 million dollars. It is understood that several blood diamonds have been found in the world, and one of them is still kept in the Smithsonian Museum. The whereabouts of the rest are unknown.
2. pink diamond: It is a light pink or rose diamond with elegant and quiet color and elegant and luxurious charm. 1980, a pink diamond weighing 2.27 carats was sold at a price of127,000 USD. 1June, 990, a pink diamond originally belonging to the Mughal Emperor of the North Indian Empire was auctioned at Christie's auction house in London, England. This diamond weighs 32.24 carats, and the auction price is 4.07 million pounds, with an average of $220,000 per carat. It is reported that Iranian King Pahlavi wore a Wang Guanzhong inlaid with a giant pink diamond, weighing about 60 carats, at his wedding in 1958. According to research, pink diamond was originally named "Sea of Light" and weighed 787 carats. It was produced in17th century in the famous Colell diamond mine in Golconda region of ancient India. The maharaja of Mimomora, who originally belonged to ancient India, was later accepted as a tribute of Mughal emperor Shajehan. After the first polishing by Indian craftsmen, it became a rose-shaped diamond ornament weighing only 300 carats. 1739, King Nadir of Persia led his troops into Delhi, the Mughal capital, and the "Sea of Light" became the trophy of the Persian kingdom and was brought back to Tehran. After several polishing, only 60 carats of modern batch diamond ornaments were left, which were renamed "Eye of Light" and embedded in the crown worn by the Iranian king at his wedding.
In pink diamond, the diamond mine in argyle produces a certain amount of pink diamond and rose diamonds. Generally, the particle size is not large, and the average price of a carat diamond is 1000 USD, of which the sales price of a 3 is. The 5-carat rose diamond is as high as $3.5 million.
Third, green diamonds: the green tones in diamonds are different, and the depth of green in a green diamond is often different. Generally speaking, a uniform green color is better, and a simple and elegant color tone is better. The most famous green diamond in the world is the "Dresden" green diamond discovered in 1743, which weighs 408 carats, even apple green. At that time, it was worth 3 million pounds, and now the lowest valuation is 10 million dollars. Dark green diamond particles have been found many times in the diamond deposit in Tancheng, Shandong Province.
4. Yellow diamond: Yellow diamond, also known as golden diamond, refers to the yellow or golden diamond with pure color and bright tone. Besides yellow and golden yellow, wine yellow and amber diamonds are also common. Such as "Taifini" yellow diamond and "Tibeia" gold diamond (the diamond weighs 234.5 carats), and the "Golden Rooster Diamond" produced in Tancheng, Shandong, China, weighs 28 1. 25 carats. This diamond is apricot yellow, gorgeous and captures sunlight. This is the largest gold diamond found in the world. 1938 was snatched by the Japanese invaders, and its whereabouts are still unknown.
Blue Diamond: It is also a charming colored diamond. A diamond that can be called a blue diamond must be pure and obvious in blue, sky blue and dark blue. For example, "Beatrix Wilhelmina Armgard" is a famous blue diamond, weighing 136.5 carats. "Hope Diamond" is also a famous deep blue brilliant diamond. When people first saw the dark blue of "Hope Diamond", they mistakenly thought it was a sapphire. Sapphire, on the other hand, does not have such a strong luster, and "Hope" gemstones can emit colorful light, and their hardness is much stronger than corundum. Later, after many appraisals, it was determined to be a blue colored diamond. This blue diamond, which originated in India, has gone through many vicissitudes, and now it falls into the hands of Americans and is collected by the Smithsonian Museum.
6. Black diamond: Generally, black opaque diamond is the least valuable variety of diamonds and can only be used as industrial grinding materials. The black diamond mentioned here is just a shiny black diamond from the outside. This kind of diamond still has the brilliance of bright and colorful diamonds. For example, on June 2, 1986, in order to commemorate the 400th anniversary of the establishment of the Diamond Center in Amsterdam, the Netherlands, the world's largest black diamond "Boehlandt" was exhibited. The original weight of this diamond is 125 carats. After three years' careful processing by Boehlandt, a famous Dutch diamond craftsman, and thousands of days and nights' efforts, after many twists and turns, we finally figured out a beautiful finished product weighing only 42 carats. This black-shelled diamond is actually a gray diamond with excellent transparency, with a diameter of 22 mm and a height of 14 mm, which shines with profound and mysterious brilliance. From its unique quality, it takes time to think,
The processing difficulty is constant. This is an invaluable diamond. If it can be sold, its price is more expensive than a blood diamond.
Colored diamond won people's hearts with its bright colors and was favored by people. Therefore, colored diamond cannot use the standard of colorless diamonds as a constant. An important factor in evaluating colored diamond is its beautiful and charming colors; The degree to which gorgeous and pure colors arouse people's love and people's appreciation of colors are important basis for evaluating colored diamond. As long as there is a favorite color, diamonds can be sold at an expensive price, although they are small.
Besides color, the purity of colored diamond is second. The purity of colored diamonds is often not as high as colorless diamonds. However, defects and cracks can not be ignored. Furthermore, colored diamond's machining and polishing is a very laborious and high-level creative process, which cannot be processed according to the standards of colorless diamonds. For colored diamond, a good group of workers can embody the color of colored diamond to the maximum extent, and make the brightness and flash of colored diamond highly harmonious with the color of colored diamond.
Due to the strong market demand and shocking "sky-high price", colored diamond has become an important commodity purchased and invested by large capital consortia. At the same time, it also stimulated the development of artificial color-changing diamond industry. In addition to the original painting methods, there are new technologies of artificial radiation treatment and color coating. This color-changing diamond is far from the natural color diamond. There is no investment to preserve and increase value, only the decorative effect of color.