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: color, luster, transparency, texture, shape, size, etc. In the case of cultured beads, there is also the problem of the thickness of [...]
Category Archives: Jewelry News
Aquamarine (Aquamarine), the mineral name is beryl, is a beryl with a lot of iron elements, as a long-standing gemstone, in the 19th century, people used aquamarine as amulet to protect sailors. Aquamarine also has some historical legends intertwined with expectations and superstitions. It has long been considered a symbol of happiness and eternal youth, [...]
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) Emerald. 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) Color. 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) Clarity. 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. Among them, there are no special optical effects, [...]
In 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 "Alexandrite" in the market. The color of alexandrite changes with [...]
(1) Color. 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: green, yellow-green, with some cracks and impurities, translucent, and the weight is above 50kg. First-class product: aquamarine, light green, yellow-green, with some cracks and impurities, translucent, and the weight is more than 10kg. Second grade product: aquamarine, light green, no cracks, a little impurity, and a block weight above 5 kg. Third [...]
Opals can be divided into four categories in terms of their body color: white opals, black opals, fire opals and glass opals. 1. White opal The body color of white opal is milky white, and may have some other colors, such as pink and light yellow, but in general it is still white, changing the [...]