Notizie di gioielli

cina gioielli artificiali Quali sono le condizioni di valutazione economica degli smeraldi?

Pubblicato il da Kingjy

There are four main economic evaluation conditions for emeralds, vale a dire: 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% E 10% of the total volume of the rough stone respectively. E 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. Per esempio, Brazilian emeralds are only worth 10-20 Dollari americani per carato, while Colombia’s high-quality emeralds are on average 400-600 Dollari americani per carato (weight above 10ct) SÌ, it can exceed US$10,000 per carat), che è più di 40 times higher than that of Brazilian products.

Emerald is brittle and prone to cracks. Perciò, 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.

Gli smeraldi colombiani sono riconosciuti come i migliori al mondo. 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 A 2 cm and a length of 3 A 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; generally, 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, rappresentando circa 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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