The charts explain the color grading system used by all GIA G.G. gemologists in their color grading of Sapphires & Rubies. The charts illustrate the wide variations in color gradings for Sapphire and Rubies as well as the three main factors which make up Sapphire's color: Hue, Tone & Saturation.

Below are the main points you want to review for "grading." It must be pleasing to your eye. Whether it be blue, pink, yellow, Padparadscha, or unique sapphire colors, this is the first priority in purchasing a sapphire. Color is subjective, but usually on beautiful things most people agree.

2022年7月7日 · Check out the simplified grading system ranging from A-AAAAA. See the blue sapphire color quality grading & styles with added information.

2021年6月29日 · Here is a chart which shows the level of saturation for gemstones and how they are graded in blues as well as reds for rubies, when the saturation drops below a 4 the sapphire will take on a slightly grayish hue and the value will drop.

Color has the greatest influence on a sapphire’s value, and preferred sapphires have strong to vivid color saturation. The most valued blue sapphires are velvety blue to violetish blue, in medium to medium-dark tones. Sapphires with these …

2023年5月26日 · The best color for a natural blue sapphire is an intense, velvety, deep royal blue. This color of sapphire would be considered AAA quality, the rarest and most valuable. The second best color is a medium rich blue, or AA quality.

2018年2月18日 · A no-nonsense Blue Sapphire Color Chart & useful Gemstone Color Chart. Study the color range of unheated blue sapphires, rare & precious gems. Singapore.

2024年3月31日 · From the serene blues to the vibrant fancy sapphires of Sri Lanka and Burma, each stone is a universe unto itself. As we explore the sapphire color spectrum, guided by the principles of hue, saturation, and tone, we gain knowledge and an appreciation for the sapphire natural masterpiece.

Why there is no universal clarity/color grading standard for colored gemstones? This handy chart below can give you a good guide how many colored stone dealers grade colored stones.

Australian Sapphire Colour Grading System. Our colour chart displays the entire spectrum of Australian Sapphire colours, ranging from deep blues, teals and greens, to vibrant yellows and oranges.