As a gemologist with extensive experience in the field of precious stones, I can tell you that the most valuable color of a ruby is often determined by its hue, saturation, and tone. The most sought-after ruby color is known as "pigeon's blood" red. This term is used to describe a vivid, medium-dark, strongly saturated, red to red-orange hue with no purplish or brownish tones. The "pigeon's blood" red is associated with rubies from the Mogok Valley in Myanmar (Burma), which are considered the most valuable due to their exceptional color and rarity.

However, it's important to note that while "pigeon's blood" red is highly prized, the value of a ruby is also influenced by other factors such as clarity, cut, carat weight, and treatment history. Additionally, personal preferences play a significant role in determining the desirability of a gemstone's color.

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Color is the most significant factor affecting a ruby's value. The finest ruby has a pure, vibrant red to slightly purplish red color. As the color becomes too orangy or more purplish, the ruby moves down the quality scale. The highest-quality rubies have vivid color saturation.read more >>