ジュエリーニュース

china artificial jewellery What are the economic evaluation conditions for emeralds?

投稿しました による kingjy

There are four main economic evaluation conditions for emeralds, namely: ①Color: emerald green and dark green are better, greenish blue and yellowish ones are inferior; ②Transparency: crystal clear, clear and bright is the best, translucent Those who can only be included in the third grade; ③Purity: emeralds are often flawed, pure ones are rare and precious, and they are special grades; the first, second and third grades should not exceed 5% そして 10% of the total volume of the rough stone respectively. そして 15%; ④Weight: The crystals or lumpiness of emeralds are very small, generally 5ct or more is a rare treasure, if it is a finished or semi-finished product, it is already very valuable above 2ct.

In addition to considering the above basic conditions, the value of emeralds from different origins is also very different. 例えば, Brazilian emeralds are only worth 10-20 US dollars per carat, while Colombia’s high-quality emeralds are on average 400-600 US dollars per carat (weight above 10ct) はい, it can exceed US$10,000 per carat), which is more than 40 times higher than that of Brazilian products.

Emerald is brittle and prone to cracks. したがって, the temperature should not be too high during polishing and inlaying, so as to avoid cracks due to overheating. The jewelry should also be careful to avoid collisions during use to avoid damage.

Colombian emeralds are recognized as the best in the world. Its color is pure green, a few of which are yellow-green or blue-green; it is a self-shaped hexagonal column with a diameter of 1 に 2 cm and a length of 3 に 5 cm. The crystal weighs 10 ct to dozens of carats. , The huge can reach several kilograms. Colombian emeralds are not only of good quality, but also have a large output; 一般的に, the annual output of high-end emeralds is more than 2,000 CT, and the low-end emeralds are 10,000 to tens of thousands of carats, accounting for about 90% of the world’s annual output. The emeralds from Russia and South Africa are of good quality, lighter in color than Colombian, and have more internal defects. Products from Brazil and India are of lower quality and prices are much lower.

 

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