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Precious Stone Rating to Success

Sunday, 08 May 2011

precious stone ratingPrecious stones is the essential component of luxury jewelry. The demand for particular precious stones changes every year due to fashion trends and market offers, for sure. However, the specialists report that the material offered at the market is for 30-70 % counterfeited product. This means only that such stones should be estimated and rated by professionals to ensure you purchase the high quality product.

Precious stone and rating

Precious stones are not rated by single value. From the view of beauty, rarity and durability rating, almost all natural stones refer to precious stones, along with synthetic ones. The specialists hemotologists somewhat restrict that notion to minerals of crystalloid structure colorless or with the vivid single-colored shade, luster, transparency, and high rigidity. Natural diamond, emerald, ruby, sapphire, alexandrite, pearl as natural stones as well as amber structure refer to precious stones.

Prior to be rated precious the stone has to be tested in several phases. First, the specialists either prove or eject the authenticity of natural origin to exclude the synthetic interference with the purpose to refine or the artificial formation of the nugget. Second, more through investigation is held to take the utmost conclusion of the stone value. The essential criteria in here is the size, carats or weight, shape, homogeneity of the material and color, various possible defects and other individual features.

Non-organic precious stone rating

Non-organic precious stones include the diamond, emerald, ruby, sapphire and alexandrite. The rule of four C is used commonly in most countries as of color, carat, clarity and cut. This system is used in USA to rate diamonds, semi-precious stones and pearls.

Color rating is done by the existing gradation system. So, there are 23 tints for the white diamond from translucent as D to white-yellow as Z. some finer characteristics are measured for fancy diamonds considering richness, homogeneity, coloration extent. The other precious stones are rated by the color scale providing 324 variations. Sometimes the deep richness, evenness and juiciness of color influence upon the final cost of the stone to the greater extent than any other parameters. So, traditionally 50% of the cost for the precious stone is the color.

As for the quality, diamonds are divided into 11 groups from ideally pure without any defects and inclusions to those with visual defects. Seven quality categories are accepted for other stones though the purity assessment is done individually for every single semi-precious stone, as emerald or ruby, for example.

Diamond cutting is classified in four quality grades from 4 as low to 1 as upper. For other stones the assessment is not that strict.

The professionals also pay attention to the quality of stones by rigidity, rarity and beauty. So, diamond’s rigidity on Mohs scale is 10, though it is frequently mined natural precious stone. And it is rare to mine the large diamond especially when after processing it becomes the most shining among all other precious stones.

Rating of pearls and amber

The assessment of such precious stones as pearl and amber is done by the same system as for semi-precious stones excluding the quality of cutting. The system is the most common and contains such rating parameters as tint, shape, size, depth applicable for the layer of pearl, luster and color. Place of origin adds to the final cost of the pearl when the sea and natural pearl is far more expensive than that from river and cultivated. Amber with some inclusions like fossil insects, lizards or frogs is found to be the exclusive discovery to appear in private collections.

It is not possible to assess the value of precious stones at home without expertise professionals and required tools. The assessment is done visually when the precious stone is placed onto the ideally white-snow sheet of paper. In the day light all defects, inclusions and cracks are seen by eye and with magnifying glass. The evenness and cutting correctness and accurateness are also defined visually. However, the perfect purity is impossible to determine in such a way. Assessment of precious stones by professionals is the most beneficial procedure, especially when the qualification, expertise and tools can contribute to rating of precious stones perfectly and unbiased. And this is up to any precious stone owner to choose for the way to assess the value of their stones.

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