Rubies and sapphires are called corundum in mineralogy. At present, the production of corundum in the world is very large, and the gem-quality corundum as red and sapphire is very rare. So how do you evaluate the quality of rubies and sapphires? Mainly based on the following four aspects.
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ã€colour】
Color is the most critical factor in evaluating the quality of red and sapphire. Ruby colors are commonly red, orange, purple, pink and maroon. The best color is the so-called pigeon blood red, which is pure red. Sapphire has blue, purple blue, green blue, black blue, etc., of which blue is most popular in pure blue or micro-purple. Pure color, high color hue and saturation, the best color.
ã€Cleaness】
The clarity of rubies and sapphires is of course higher. However, the clarity of colored gemstones is mainly evaluated by visually observing the apparent degree of plutonium. The naked eye does not see obvious cracks under the ceiling lighting, and the inclusions and ribbons are top grades. If the enamel affects its durability and transparency, the quality is poor.
[cutting]
The cutting of red and sapphire is mainly evaluated in terms of the shape, proportion, symmetry, and degree of polishing. The most common types of ç¢ are elliptical faceted and round faceted and stepped. The quality of its cut will also affect its color and brightness.
[Carat weight]
High quality rubies rarely have large particles, and 1 to 2 carats are considered treasures. But high-quality sapphire is relatively large, and 10 carats of high-quality sapphires are not uncommon.
[Special optical effect]
For red and sapphire with special optical effects, in addition to the above factors, it is also necessary to consider whether the star line is symmetrical, continuous, and whether the central Baoguang is strong. The price of Star Ruby is slightly lower than the equivalent quality of the transparent ruby ​​variety. Starlight rubies are mainly produced in Myanmar and Sri Lanka.
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