When you buy diamond jewelry, you will judge the quality of the gem based on the product information on the certificate. Because of the grading of diamonds and colored stones on the certificate, let us have a quantitative understanding of these stones. However, many people will find that two gems of the same grade are displayed on the jewellery certificate, but there will still be huge price differences when actually buying, so how is the price difference? Gem grade is an interval, not a fixed value The two diamonds in the above picture are all H colors, but one is close to the upper limit and one is close to the lower limit. With cut and clarity, it may give people a different look and feel. The more expensive the gems, the greater the difference in price Small-grain diamonds and colored stones are basically the same price at the same level, while the price of large particles is different. The color is the same level, and the comprehensive clarity, cut, size and other factors, the two similar size pigeon blood red has a difference of about 4 million US dollars. The yellow color on the left side is more, and the green color on the right side is higher. The current market price is slightly higher on the right side. How do you choose a gem? To choose a collection value, follow these guidelines: Look at the color: the deeper, the more saturated, the more uniform, the brighter the better. Look at the cut: the more symmetrical, the stronger the fire, the better. Look at the inclusions and cracks: the less the inclusions, the cleaner, the more transparent the better. Look at the weight: the bigger the more rare, the higher the value. Look at the place of origin: for high-end colored gemstones, such as the ruby ​​produced in Myanmar, the emerald produced in Colombia, etc., will affect the final value! Our factory mainly professional customized Zinc Alloy Belt Buckle for any logo design.After our professional recommendation,the belt buckle will be looks good. Metal Belt Buckles For Crafts,Custom Belt Buckle Metal,Custom Engraved Belt Buckles Shenzhen MingFeng Art & Craft Products CO., LTD. , http://www.enamelkeychain.com