Star Ruby

Star ruby is a rare and precious gemstone, prized by collectors and connoisseurs the world over. Perhaps the most fascinating aspect of these gemstones is their ability to exhibit asterism – a rare phenomenon that causes them to appear to have a six-pointed star in the center when they are held up to a light. The star effect is caused by the reflection of light off inclusions within the stone.


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Star Ruby Gemstone Information

Star rubies are a unique form of ruby gemstone that captivate their admirers with their distinctive appearance. Star ruby is characterized by its unique phenomenon called asterism, where the stone exhibits a star-like sheen when it is moved in the light. This phenomenon occurs as light reflects off tiny, needle-like inclusions of rutile located within the gem, forming a six-rayed star pattern.

This variety of ruby stones is an exotic and rare gemstone that has captivated people’s imagination for centuries. It is known for its captivating, star-like pattern that radiates from the center of the stone. This optical phenomenon is caused by inclusions of rutile needles that intersect within the ruby, resulting in a six-rayed star effect when exposed to light. Its mesmerizing beauty and rarity make it one of the most sought-after gems in the world.

Gemstone Attributes

Mineral Corrundum
Chemistry Al2O3
Color Red - Vivid Red
Refractive Index 1.762 - 1.770
Birefringence 0.008 - 0.010
Specific Gravity 4.00
Mohs Hardness 9.0

Star Ruby Value

The star ruby, also known as a 'chatoyant' or 'cat's eye' ruby, is one of the rarest and most expensive gemstones in the world. Its rarity lies in its unique optical phenomena - when cut and polished properly, it will have light reflected so that a six-rayed star effect appears to float across its surface of silky luster. Only about 1 percent of all rubies possess this striking effect and usually come in small carat weight and any larger sizes of star ruby are considered to be a rare variety and exclusive colored gemstones.

The semi-transparent clarity star rubies is an even rarer version of this gemstone and can be identified by its deep red color. Due to its transparency, you can clearly see the asterism shining through the stone’s surface. This semi-transparency affects the prices of gem-quality blue star sapphire as well.

Star rubies are especially prized for their exceptional beauty, which makes them highly desirable among both jewelry collectors and connoisseurs alike. As expected with such precious gemstones, their value can reach exorbitant levels depending on quality and size; some of the finest specimens have been sold for millions of dollars at auction houses around the world.

Famous Star Rubies

The Rosser Reeves and Deelong star rubies are two of the most famous gem quality colored gemstones in the world. The Rosser Reeves star ruby is a 41.41 carat cabochon, mined from Mogok in Myanmar. It was named after its previous owner, advertising executive Rosser Reeves, who purchased it from a gem dealer in 1954. This magnificent stone displays a beautiful six-rayed asterism when turned under direct light.

The Deelong ruby is another spectacular star ruby that is also found in Myanmar. This 100ct carat stone features an intense red hue and strong six-ray asterism that creates an unforgettable optical effect when viewed under the light. The Deelong has previously been owned by some of the wealthiest collectors across the world and continues to be highly sought after for its rarity and exquisite beauty.

Heated Star Ruby gems

A Heated Star Ruby Gemstone is considered to be less expensive compared to other unheated star rubies which are more expensive price per carat, making it an attractive option for those interested in owning a piece of luxury jewelry.

The price of a Heated Star Ruby Gemstone can vary greatly, depending on the size and quality of the stone. Generally, prices are anywhere between $50 to $200 per carat and can go up even higher with larger stones or better-quality gems. It is important to shop around and compare prices from different retailers before purchasing any precious gemstones.


The red gemstone star ruby is the premier gemstone of its kind, known for its distinctive color and beauty. The most desirable shade of the red star ruby is "pigeons blood", a vivid, deep hue that can range from a pure, intense raspberry red to an orangey-pinkish red. This sought-after color has been compared to the dark red color of a pigeon's blood or liver, hence its unique name.

The vibrant colors and unique shades of the red star ruby have made it highly desired among collectors since ancient times. Its remarkable beauty has also attracted prominent figures such as royalty and celebrities alike who sported pieces with these precious gems adorning their garments.


The Star Ruby is a mineral gemstone that has held significant cultural and religious importance to many cultures for centuries. It is primarily sourced from Africa, Burma (Myanmar), Australia, India, and Sri Lanka. The origin of this rare stone can be traced back to antiquity when it was used in royal jewelry and religious rituals.

This beautiful mineral has distinctive asterism - the phenomenon of light reflecting off its surface in the form of a six-rayed star pattern - which makes it stand out among other gemstones. This star effect occurs due to the presence of rutile needle inclusions that are aligned within the crystal structure of corundum; the same substance that forms rubies and sapphires. The unique combination of transparency and light refractive properties gives rise to its remarkable shine when illuminated by a single source such as sunlight or lamplight.


Star ruby is a type of gemstone that features an asterism, an optical phenomenon caused by tiny needle-like rutile inclusions. These inclusions are known as "silk" due to their resemblance to the fabric, and they form intersecting lines that reflect light in a six-rayed star pattern when viewed under direct sunlight or bright artificial lighting. This effect is known as a 'star' or 'asterism', and it can be used to identify star rubies from other types of gems.

Star rubies are highly prized for their beautiful patterns, which originate from the complicated structure of the rutile needles within the stone. The amount of silk present influences how clearly visible the asterisk is: more silk results in a brighter star pattern.

12 Ray Stars

The 12-ray star ruby is a rare and unique gemstone with an abnormal number of rays. This precious stone has long captivated admirers for its unusual characteristics and stunning beauty. Found in only the most special deposits, this remarkable stone can set apart any piece of jewelry from the rest.

The 12 rays are indicative of its rarity, gems with this many converging points are considered extremely valuable. Collectors around the world seek out these magnificent stones, which are often used as centerpieces in exclusive pieces of jewelry.

Star Ruby Benefits

The presence of this phenomenon makes star rubies highly sought after and treasured among jewelry enthusiasts who appreciate their distinctive look and symbolic meaning. Star rubies can be found in various sizes, shapes, and tones ranging from deep red to bright pink, making them suitable for any type of jewelry collection or design.

STAR Ruby Care

In terms of cleaning it, warm water with mild soap can be used to remove dirt and debris. Be sure not to use any harsh chemical solutions as they may damage the ruby's delicate surface. Additionally, diamond jewelry cleaner should not be used on star rubies or star sapphire either because their hardness measures only 9 on the Mohs scale (compared to diamonds which measure 10).