On a natural basis, connoisseurs use 4C to measure the value of a gem: Color, Clarity, and Car-at. Typically, Color has a 50% effect on the value of a gem, followed by Clarity and size, finally for cutting. The order of 4C values for rubies and 4C values for diamonds varies, but the principle remains the same, that is, the order and proportion of the stones are arranged according to their beauty and permanence, as well as their rarity.

As far as rubies are concerned, not all rubies are valuable for collection. Ruby with good color, big grain, high clarity and good color must be selected. So from the color, clarity, fire color, weight, characteristics of observation and certificates, choose rubies. The first thing you see about Ruby is the color. The more saturated, the more uniform, the brighter, the better. As a general rule, a dark and positive ruby must be more expensive than a light one; a bright one must be more expensive than a dark one.

Ruby is generally divided into deep red, red, medium red, light red, light red five levels. Ruby has a variety of colors, the best is a deep pure red, followed by a micro-purple red, followed by a deep pink, purplish red, slightly brown red, others, such as reddish brown and blackish red, are poor rubies.

Color is the color of a gem in natural light. It is the key to evaluating Ruby. The purer and more intense the colour, the better the quality. If the Gem has a green, black tone or a lighter color will affect the value of the gem.

The most precious Ruby is the blood-red ruby of the Burmese pigeon, named for its resemblance to the extremely red blood of a pigeon in Mogok. This can almost be called a deep red of strong color, pure red contains a blue tone, giving a strong“Burning fire” and“Flowing blood” feeling.

Cherry Red is also very famous, from Sri Lanka, high-end Ruby. This kind of color is because of the red tonal contain a little purple, make the gem color is equally gorgeous, noble not vulgar. In addition, there are other areas of the world where rubies are extremely beautiful in colour, such as the Mozambican ruby known as Winsor, which has a rich red colour with a slight yellow tint, it's fascinating. It is also extremely expensive on the international market.