If you like the elegance of emeralds and the enthusiasm of rubies, it is really awkward when choosing a piece of jewelry. However, there is a kind of gem that can be perfectly changed in different lights. From the quiet blue and green moments, it is transformed into a seductive crimson. It is known as the "emerald in the day, the ruby ​​in the night".
What is a stone?
The first time a human discovered a discolored gem was in 1830. On a mining emerald mine in the Ural Mountains of Russia, miners found a strange stone that was green in daylight and red in the nightlight. So this rare gemstone that I had never seen before was presented to the then Russian Crown Prince Alexander II, and this gem also got the name nowadays - Alexander Stone.
Alexander Stone
Left: green under the fluorescent light, right: purple under the incandescent lamp
"Fallen", on the surface, is a gem that will change color. But not all gems that change color can be called marbles?
Gemology stipulates that the effect of gems in different colors under the illumination of different light sources is called the color change effect. Like sapphire, spinel, tourmaline, fluorite, etc., there may be a color change effect, but we can only add the word "discoloration" before the name, such as "color sapphire", "color garnet", etc. . Only the gold emerald with the effect of discoloration can be called "the stone".
The value of the stone
The magical color change effect of the stone is enchanting. In daylight, the stone is usually grayish green, yellowish green or blue-green; under incandescent light, it is usually maroon or purple. But collectors are always pursuing the top marbles that can reach the emerald green and the bright red of ruby, although this is difficult to achieve. When a marble particle of more than 1ct is complete and has a significant color change effect, it is the best treasure. If you can combine the obvious cat's eye effect in one body, it is even more precious and of great value.
The gold emerald itself is among the top seven treasures in the world, and the value of the stone is naturally high.
On October 23, 2007, Christie's Jewelry and Jade Jewelry Auction in Hong Kong showed a 212.76ct giant stone cat eye. This is the largest cat's eye in the history of the auction, Alexander Stone, estimated at 7.85 million Hong Kong dollars - 12 million Hong Kong dollars.
On October 15, 2013, at the Christie's Jewelry auction held at the Rockefeller Center in New York, a stone-cutting platinum ring with a weight of 18.23ct shot at $557,000, and the price per carat exceeded $30,000.
True and false color distinction
In the jewelry market, artificial corundum, stone, artificial spinel, artificial synthetic stone, and natural stone are sold. The main basis for visual identification is pleochroism, inclusion characteristics and particle size. Natural rhinestones are dark green or greenish green in daylight and have a particle size of less than 1 cm. Tri-color. It has two phases of gas and liquid inclusions. Artificial corundum stone has only dichromatic properties. Artificial spinel has no pleochroism. Artificial corundum and artificial spinel have a gas, liquid inclusion and curved ribbon.
Of course, the most assured is the certificate of gem identification. The certificates of Gublin and SSEF are the most convincing of the current authorities. Please remember to find the certificate to be purchased when you purchase.
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