According to the records of ancient books, the earliest colorful diamonds in the world were mostly produced in India. In the ancient Indian diamond mining areas, there have been many famous world-class colored diamond diamonds, such as blue Hope diamond, pink Big Mughal diamond, de Reston green diamond and Taifini yellow diamond. A few days ago, most of this colored diamond was embedded in the royal families of some countries in Europe and Asia, some in the crown and some in the scepter, which became a symbol of wealth and power, and it was a rare thing for ordinary people.
colored diamond has also been found in the diamond producing areas in northern China. According to the Linyi County Records written as early as 1917, "Diamonds are as clear as water and colorless, those with white, yellow, red and green colors are used for jewelry, and those with small ones can be scratched with glass, which is often picked and not always available." It shows that as early as 1 years ago, colored diamonds were discovered in China and used as "treasures".
In recent ten years, in a jewelry fair held in Europe and America, colored diamond's exhibition and auction activities have successfully attracted a large number of customers, which has played an important role in invigorating the towel market and promoting the sales of jewelry. Thus, the colored diamonds themselves are displayed to the audience, and the mysterious veil of extremely rare and expensive colored diamonds is unveiled, so that ordinary consumers have a chance to see the noble appearance of colored diamond and arouse people's stronger interest and hobby in jewelry.
for colorless diamonds, people regard the slight yellow color in colorless diamonds as the main factor of diamond degradation. Therefore, in the evaluation of colorless diamonds, China implements the evaluation standard of 1 color grades, which is called "Baise grade". The crystal clear, water-transparent "water purification diamond" without any yellow and other miscellaneous tones is classified as 1 colors, which is the best among colorless diamonds. The shallow yellow diamonds, which are difficult to be observed by naked eyes, are classified as 99-95 color grades, and these diamonds are also high-quality products among colorless diamonds. By 94-75 color grades, the yellowish tone contained in the diamonds can be detected by naked eyes, and the lower the color grade, the more obvious the yellow tone is. Diamonds below 75 colors are easy to see with the naked eye, and these diamonds can no longer be used as gems unless they are yellowed by people.
among colorless diamonds, there is also a kind of crystal-clear and water-transparent diamond, which can feel a pure light blue with naked eyes. This kind of diamond is called "fire and water diamond" and is also the best among colorless diamonds.
most natural diamonds contain various pigments. Generally speaking, pigments have a great influence on evaluating the quality of colorless diamonds, such as impure bluish or yellowish, brown and brown, which are all important factors to degrade colorless diamonds. However, when a diamond has a pure and obvious color, it does not belong to the category of "colorless diamond", especially when it has bright red, dark blue, pink, rose, golden yellow and green colors, it belongs to a rare colored diamond. Colored diamond known a few days ago can be divided into the following categories according to color:
1. Red diamonds: Red diamonds can be divided into blood diamonds and purple diamonds according to color. Blood diamond is bright red as blood and gorgeous, which is extremely precious and rare among colored diamonds. In the spring of 1989, a blood diamond named "Laqi" with a weight of 2.23 carats was exhibited at a jewelry fair in Paris, with a bid price 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 than 1, times that of gold and more than 2, times more expensive than colorless diamonds. "Laqi" blood diamond originated in the ancient Indian diamond mining area of Gorgonda, which means "great wealth". Judging from its batch production, it has a history of nearly 5 years.
in April, 1987, in a jewelry auction in the United States, a purple diamond weighing . 95 carats was sold for $88,, and other expenses were nearly $95,, setting a record of nearly $1 million per carat for the purple diamond. It is understood that several blood diamonds have been found in the world, and one is still preserved in the Smithsonian Museum in the United States. Where the rest fall into is unknown to the world.
second, pink diamond: a pale pink or rose colored diamond with light and quiet colors and elegant and luxurious charm. In 198, a pink diamond weighing 2.27 carats was sold in Geneva, Switzerland, and the price was 127, US dollars. In June, 199, a pink diamond originally belonging to the Mughal emperor of the northern Indian empire was auctioned at Christie's auction house in London, England. The diamond weighed 32.24 carats and was hammered at 4.7 million pounds, with an average of 22, US dollars per carat. It is reported that when Iranian King Pahlavi held his wedding in 1958, he wore a Wang Guanzhong inlaid with a giant pink diamond, weighing about 6 carats. According to textual research, the original name of the pink diamond was "Sea of Light", and the original weight was 787 carats. It was produced in the famous Colell diamond mine in Gorkangda area of ancient India in the 17th century. The original belonged to the maharaja of Mimo Mora in ancient India, and was later paid tribute to the Mughal Emperor Shajiehan. After being polished by an Indian craftsman for the first time, it became a rose-shaped diamond ornament weighing only 3 carats. In 1739, King Nadir of Persia led an army 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 times of grinding, only 6 carats of modern batch diamond ornaments are left, and they are renamed "Eye of Light" and embedded in the crown worn by the Iranian king at his wedding.
In pink diamond, a certain amount of pink diamonds and rose diamonds are produced in the diamond mines in argyle, Australia. Generally, the particle size is not large, and the average price of each carat diamond is $1,. Among them, the sales price of a 3. 5-carat rose gem diamond is as high as $3.5 million.
third, green diamonds: the green tones in diamonds vary, and the shades of green are often different in a green diamond. Generally speaking, it is better to have a uniform green color and a simple and elegant tone. One of the most famous green diamonds in the world is the "De Reston" green diamond discovered in 1743, which weighs 48 carats and is even apple green. At that time, it was worth 3 million pounds, and now the lowest valuation is 1 million dollars. Dark green diamond particles have been found many times in the diamond deposits in Tancheng, Shandong, China.
fourth, yellow diamond: yellow diamond is also called golden diamond, which refers to the yellow or golden colored diamond with pure color and bright tone. Besides yellow and golden yellow, wine yellow and amber colored diamond are also common. Such as "Taifini" yellow diamond and "TiBei Ya" gold diamond (which weighs 234.5 carats), and "Golden Rooster Diamond" produced in Tancheng, Shandong, China, weighs 281. 25 carats. This diamond is very apricot yellow, which is very gorgeous and captures the sun. It is the largest gold diamond found in the world. It was robbed by the Japanese invaders in 1938, and its whereabouts are still unknown.
Fifth, the blue diamond: It is also a fascinating colored diamond. A diamond that can be called a blue diamond must be a diamond with pure and obvious blue, sky blue and dark blue. For example, "The Queen of the Netherlands" is a famous blue diamond, which weighs 136.5 carats. "Hope Diamond" is also a famous deep blue brilliant diamond. When people first saw the deep blue color of "Hope Diamond", they mistakenly thought it was a sapphire. However, sapphire does not have such a strong luster, and "hope" gemstones can emit colorful colored light, and the hardness is much stronger than that of corundum. Later, it was identified as a blue colored diamond after many times of identification. This blue diamond, which originated in India, has experienced many vicissitudes, and now it falls into the hands of Americans and is collected by the Smithsonian Museum.
six, black diamond: general black opaque diamond, which is the least valuable variety of diamonds and can only be used for grinding materials in industry. The black diamond mentioned here is just a black and shiny 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 4th 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 the diamond was 125 carats. After three years of careful processing by the famous Dutch diamond master Boehlandt, thousands of days and nights of hard work, after many twists and turns, the exquisite finished product weighing only 42 carats was finally figured out. Although the weight was reduced by two thirds, it is still the world. This black-shelled diamond is actually a gray diamond with excellent transparency, with a diameter of 22 mm and a height of 14 mm, shining with deep and mysterious brilliance. From its unique quality, the time it takes to ponder, and the difficulty of processing,
this diamond is difficult to estimate its value. If it can be sold, its price is more expensive than a blood diamond.
Colored diamonds win people's hearts and are favored by people because of their bright and beautiful colors. 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 the level of people's appreciation of colors are the important basis for evaluating colored diamond. As long as there is a favorite color, diamonds, though small, can be sold at an expensive price.
besides color, the purity of colored diamond is the second. The purity of colored diamond is often not as high as that of colorless diamonds because of color. However, defects and cracks can not be ignored. Furthermore, colored diamond's processing 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 batch of workers can embody the color of colored diamond to the maximum extent, so that the brightness and flash of colored diamond can be highly harmonious and unified with the color of colored diamond.
colored diamond has become an important commodity for big capital consortia to buy and invest because of its strong market demand and high "sky-high price". At the same time, it also stimulated the development of artificial color-changed diamond industry. In addition to the original painting method, there are new techniques of artificial radiation treatment and color coating. This color-changed diamond is a far cry from natural colored diamond. There is no investment to preserve and increase the value, only a decorative role of color.