There are many places where pearls are produced in the world. Natural pearls are mainly produced in the Persian Gulf, Red Sea, South Pacific, Gulf of Mexico, и т. д.. They can be divided into Eastern Pearl, Южная Жемчужина, Australian Pearl, Southern Ocean Pearl, Black Pearl, Oriental Pearl, и т. д.. Due to pollution, the yield and quality of […]
Автор: Король
The quality evaluation method of pearls can be said to be very systematic and scientific, just like the 4C grading of diamonds. The international evaluation of pearl quality mainly includes the following aspects: цвет, блеск, transparency, текстура, shape, размер, и т. д.. In the case of cultured beads, there is also the problem of the thickness of […]
Аквамарин (Аквамарин), название минерала берилл, это берилл с большим количеством элементов железа, как давний драгоценный камень, в 19 веке, люди использовали аквамарин как амулет для защиты моряков. Об Аквамарине также ходят исторические легенды, переплетенные с ожиданиями и суевериями.. Издавна его считали символом счастья и вечной молодости., […]
cryptocrystalline quartz jade. Chalcedony and agate have a very long history. About 100 million years ago, underground magma spewed out due to the changes in the earth’s crust. When the lava cooled, steam and other gases formed bubbles, and the bubbles were sealed when the rock was frozen to form many holes. After a long […]
German glasses brille extends from beryl, because the earliest spectacle lenses were ground with colorless beryl. The color of beryl gemstones is one of the classification criteria. (1) Изумруд. With chromium or iron as the color characteristic, green beryl with emerald green color can be slightly yellow or blue, and its typical characteristic is the […]
(1) Цвет. The best emerald color is that strong emerald green with a little blue tone, that green will make people unforgettable. Positive green and slightly yellowish grass green are also very good, while dark green and light green are inferior colors. (2) Ясность. The clarity of emeralds is generally not very good, with large […]
The main varieties of chrysoberyl gemstones, cat’s eye and alexandrite, are important precious gems in the world. In addition to cat’s eye and alexandrite, chrysoberyl gemstones also include chrysoberyl, which refers to gold that does not have the discoloration effect and the cat’s eye effect. Emerald gems. Среди них, there are no special optical effects, […]
В 1830, a gem that changed color was discovered in the Ural Mountains in Russia, namely alexandrite. This day happened to be the birthday of Emperor Caesar Alexander II of Russia, so he named him Alexandrite after the Emperor of Russia. It was also called “Александрит” in the market. The color of alexandrite changes with […]
(1) Цвет. The beeswax yellow is the best, followed by green, yellow-green, yellow-brown, gray-green and gray-yellow again. When the light illuminates the gemstone from the side, half of the cat’s eye is its body color, and the half becomes other colors, which is also a good performance. As for cat eyeliner, the brighter and more […]
Special grade product: зеленый, yellow-green, with some cracks and impurities, translucent, and the weight is above 50kg. First-class product: аквамарин, светло-зеленый, yellow-green, with some cracks and impurities, translucent, and the weight is more than 10kg. Second grade product: аквамарин, светло-зеленый, no cracks, a little impurity, and a block weight above 5 кг. Third […]