Please keep in mind
However these stones are relatively rare, the frequently found diamonds 80 being of industrial quality. Colored Gemstones . As one would predict, truly colorless stone will carry premium price, and the larger that diamond, the greater the premium per carat. Colors of high saturation such as red and green, which have no modifying secondary colors, are very rare indeed and command world record prices. Nevertheless, make sure you verify that there is no effect of fluorescence under all conditions of lighting from bright sunlight to all types of artificial lighting.
are known to be strict and accurate in their color and clarity grading, Duttons Diamonds sells diamonds with ONLY these grading reports certificates, certs and no others. Effect of color on price In general, as the amount of yellow in the stone increases, the value of diamond decreases, that is until the fancy color grades are reached, and then the value goes up again. Similarly, the HPHT technique has also been applied to type Ia brown diamonds by several companies, yielding fancy yellowish green and greenish yellow colors.
discussion of the variety and causes of the different colors, which occur in fancy colored diamonds, can be found elsewhere on this site. Colors of high saturation such as red and green, which have no modifying secondary colors, are very rare indeed and command world record prices. Irradiation of diamonds using nuclear reactor or linear accelerator, sometimes in combination with heating, is used to produce variety of different fancy colored stones.. Colors and are essentially without color and differ more in transparency. If it does make sure that it is BLUE and not some other color. 36, Fall, pp.
As one would predict, truly colorless stone will carry premium price, and the larger that diamond, the greater the premium per carat. Factors Affecting Color Other factors which can affect color include fluorescence, color enhancements such as high pressure, high temperature treatment HPHT and irradiation. Another important and wellrespected grading lab is the American Gem Society Labs.
Diamonds are color graded by being compared to set of master stones. Those suitable for gem use 20 usually have some yellow tint, due to the presence of small amount of contaminating nitrogen. How to Order . Fluorescence, produced by ultraviolet light from the by black lighting or other longwavelength UV source, occurs in an estimated 35 of gem grade diamonds. Collectively, these colored diamonds are called fancy colored diamonds, and include the fancy colored yellow diamonds found at the far end of the color spectrum of the socalled white or colorless stones we will focus on here.
Tags: diamonds, yellow diamond