Grading Of Ruby Gemstone


Gem lovers often do not understand why few ruby gemstones are on sale at a higher price and why others are on sale at a low price. In fact, the above question sometimes pops up in the mind of a gem insider also.

The reason behind the above confusion is that the price of ruby gemstones or other precious gemstones is completely resolute on the basis of the number of inclusions, cut, clarity and certification of the stone.

Thus, A ruby gemstone with low inclusions, high clarity and cut will be sold at a higher price. On the other hand, a ruby gemstone with more inclusions, less clarity, and common cut will be sold at a low price. In this comprehensive guide, we will delve into the intricate process of grading rubies, exploring the factors that influence their quality and the standards used by experts in the gemstone industry.

Understanding the Ruby:

Before delving into the grading criteria, it’s essential to understand what makes a ruby unique. Rubies belong to the corundum family, sharing their mineral composition with sapphires. The characteristic red color of rubies is attributed to the presence of chromium, with shades ranging from light pinkish-red to deep, almost purplish-red.

Factors Influencing Ruby Grading:


Hue: The primary factor in grading rubies is their color. A pure red hue, often referred to as “pigeon blood red,” is the most coveted. The presence of secondary hues, such as purple or orange, can impact the overall grading.

Saturation: The intensity of the color, known as saturation, is another crucial aspect. Vivid, highly saturated red rubies are considered more valuable than those with a muted or washed-out appearance.


Rubies, like many gemstones, can contain natural inclusions. These imperfections, often referred to as “silk” due to their appearance, can affect the transparency of the gem. However, some inclusions, like the famed “star” effect, can enhance the ruby’s appeal.


The cut of a ruby impacts its brilliance and overall visual appeal. Gemstone cutters aim to maximize the stone’s color and minimize inclusions while adhering to traditional shapes like oval, round, or cushion.

Carat Weight:

While not as influential as color or clarity, the carat weight of a ruby does play a role in its value. Larger rubies are rarer, and as a result, they often command higher prices.

Grading Systems:

Several grading systems are used to assess the quality of rubies, with some of the most prominent being:

Standard Grade Ruby Gemstone:

The stone ruby, which falls under this category is nominated as the least expensive ruby stone. Therefore, all those individuals or gem lovers who wish to subscribe to this stone can buy standard ruby gemstones.

The shine and clarity of the standard ruby will not exceed the determined standards of the gem market.

Nonetheless, those individuals who want to wear this stone, but don’t want to bear many burdens on their pocket. Finally, they should opt for the standard quality ruby gemstone.

Fine Quality Ruby Gemstone:

The fine quality ruby gemstone is an upgraded version of standard ruby stone. The stone contains fewer impurities and more clarity, the luster that overall enhances the value of this stone.

Despite this, the fine category ruby gemstone still possesses inclusion that can be seen with the bare eyes. Nevertheless, the quantity of inclusions is bare as compared to the earlier one.

Premium Quality Ruby Gemstone:

The premium quality ruby stones are a high-quality stone with bare inclusions and first-class color properties. It is barely impossible to locate any inclusions or blemish spot in the stone with bare eyes.

Super-premium Ruby Gemstone:

The super-premium ruby stones are the finest quality ruby gemstone of all the grading of ruby .

The stone contains almost no inclusions and different varieties of shapes and color properties impress everyone.

However, the super-premium ruby gemstone is extremely expensive and it costs an arm and a leg to a person whosoever will purchase this category of the ruby gemstone.

Thus, If you want to buy ruby stone first consider the natural ruby stone before buying this stone.

Geographic Origin:

The origin of a ruby can significantly impact its grading and value. Certain regions are renowned for producing high-quality rubies with distinct characteristics:

Burmese Rubies:

Rubies from Myanmar (formerly Burma) are often considered the most desirable. They are known for their intense red color and a fluorescent quality that enhances their brilliance.

Mozambique Rubies:

Rubies from Mozambique are gaining prominence in the market. These gems are prized for their rich, red hues and are often more affordable than their Burmese counterparts.

Thai Rubies:

Thai rubies are known for their darker red color and are sometimes treated to enhance their appearance. These rubies are valued for their unique color variations.

Ruby Treatments:

Gemstone treatments are common in the industry to enhance a ruby’s color and clarity. Heat treatment, in particular, is widely accepted and can improve the stone’s overall appearance. However, it’s crucial for buyers to be aware of any treatments a ruby has undergone, as this can affect its long-term durability and value.

Investing in Rubies:

Investing in rubies requires a combination of knowledge and discernment. While the market for these gemstones continues to grow, it’s essential to consider factors such as rarity, quality, and market trends. Seek guidance from reputable gemologists and dealers to make informed investment decisions.

In the world of gemstones, rubies stand out as timeless symbols of passion and elegance. Understanding the grading criteria for rubies empowers buyers to make informed decisions and appreciate the unique qualities of these exquisite gemstones. Whether you are a collector, investor, or someone seeking a meaningful piece of jewelry, the grading of ruby gemstones serves as a valuable guide on the journey to acquiring a true masterpiece of nature.


Frequently Asked Questions :

1: What makes rubies unique among gemstones?


Rubies belong to the corundum family, sharing their mineral composition with sapphires. The distinct red hue of rubies is attributed to the presence of chromium, ranging from light pinkish-red to deep, almost purplish-red shades.

2: What are the key factors influencing the grading of rubies?

 The primary factors include color, clarity, cut, and carat weight. Color is the most crucial, with considerations for hue and saturation. Clarity assesses the presence of inclusions, while cut determines the stone’s brilliance and overall visual appeal. Carat weight, though less influential, can affect a ruby’s value.

3: How is color assessed in the grading of rubies?

 Color is evaluated based on hue and saturation. The most coveted hue is a pure red, often termed “pigeon blood red.” Saturation measures the intensity of the color, with vivid, highly saturated rubies considered more valuable.

4: What role does clarity play in the grading process?

 Clarity assesses the presence of inclusions, which are natural imperfections in the gemstone. While some inclusions may impact transparency, others, like the famed “star” effect, can enhance a ruby’s appeal.

5 : How does geographic origin affect the grading and value of rubies?

 The origin of a ruby can significantly impact its characteristics. Burmese rubies, for example, are highly prized for their intense red color and fluorescence. Mozambique rubies are known for their rich red hues, and Thai rubies often have unique color variations.

6: Is it essential to know about the grading of rubies when purchasing one?

 Yes, understanding the grading criteria for rubies is crucial when making a purchase. It empowers buyers to make informed decisions, appreciate the unique qualities of each gemstone, and ensure that they are getting value for their investment.

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