Pearls have been traded for thousands of years, but there is still no commonly accepted measure.
Part of the problem is that no two pearls are alike, so a complete grading system would require hundreds of quality parameters. Some gemological quality pearls are so rare that they can be compared.
The quality-value rating measure has to do with 5 key factors which are the following:
Size. Pearls are measured in millimeters. In general, the larger the pearl, the more expensive it is. The dimension that is most popular today is between 61/2 and 81/2 mm. The measurement in a necklace is always done in 2 sizes, eg 7 – 71/2, ie all the pearls of the necklace range from 7 to 71/2 mm and this is due to their uniqueness.
Shape. The rounder, more symmetrical pearl is also the most expensive. Baroque pearls that are asymmetrical may be shiny and beautiful but often cost less than round ones.
Surface. The perfect pearl should be without any marks, protrusions or cracks. The more marks and spots it has, the more its value falls.
Colour. Pearls are made in various colors from pink to black. The color is purely personal taste silver and white pearl is best suited for light skin tones, as cream and gold pearl shades are suitable for dark skin tones. We recommend Imperial White White with a light pink shade as a perfect color.
Shine. The combination of the glossy surface of the pearl and the depth of polishing. High quality pearls should be open, dazzling and able to reflect any object near them.