A rare yet equally fascinating variety of the Ruby gemstone, Star Rubies exhibit a special effect called “asterism”. This effect is a beautiful display of a six-rayed star that shines over the gem’s surface when it is moved. The silky shine of the star is attributed to rutile inclusions.
How the star-effect in star rubies occur?
The dense inclusions of tiny needle-like inclusions of rutile, called silk, are responsible for creating the magnificent star-effect in these natural rubies. The phenomenon occurs when light reflects from rutile inclusions aligned perpendicular to the rays of the star. The presence of rutile is, thus, considered desirable in star rubies.
Are Star Rubies easily available?
Well, the availability of star rubies is a big concern for the gem lovers and sellers today. Approximately, from every 100 rough corundum gemstones that are mined, only three get the star effect after they are given the cabochon cut. But, not all these star rubies are perfect.
One may not have the right color; one may not have the ideal star – leaving the probability of producing the perfect star ruby gemstone to one in hundred.
As many rubies are given faceted cuts, the production of star rubies is becoming rare due to the shortage of cabochon cut rubies.
Understanding Star Rubies
Star rubies are truly extraordinary gemstones that possess a mystical allure. These rare gems are known for their mesmerizing asterism effect, which gives them the appearance of a star shimmering across their surface. To fully appreciate the beauty and significance of star rubies, it is important to understand their formation process, the role of inclusions, and the key sources of these exceptional gemstones.
Formation of Star Rubies
The mesmerizing asterism effect in star rubies is created by inclusions, specifically silk formations, within the gemstone. Silk refers to fine needle-like rutile or hematite inclusions that intersect within the ruby. When these inclusions align in a specific orientation, they create a phenomenon called asterism, where a star-like pattern emerges when light interacts with the gemstone.
The formation process of star rubies begins under specific geological conditions. The presence of chromium and iron impurities in the corundum mineral, combined with high temperatures and pressure during crystal growth, contribute to the formation of silk formations.
Key Sources of Star Rubies
- Myanmar (formerly Burma): Renowned for producing high-quality star rubies due to unique geological conditions that lead to strong silk formations.
- Sri Lanka: Another country known for star ruby production.
- Thailand: Known for its production of both heat-treated and untreated star rubies.
- India: Produces both translucent and opaque star rubies.
- Tanzania: Known for its pinkish-red star rubies.
Myanmar’s Mogok region is famous for its exceptional star rubies. The rubies from this region are known for their vivid red color and intense asterism. The tightly knit silk formations within these rubies create a sharp and well-defined star pattern that adds to their allure.
Grading, Cutting, and Carat Weight of Star Rubies
Star rubies are rare gems that exhibit a unique phenomenon known as asterism, which is the appearance of a star on the surface of the gemstone. This effect is caused by the presence of needle-like inclusions, specifically silk formations, within the ruby. Grading and evaluating star rubies involves considering their color, clarity, cut, and carat weight.
Color Grading
Color is one of the most important factors in determining the value of a star ruby. The ideal color for a star ruby is a deep red hue with a vibrant saturation. The more intense and vivid the color, the higher the value of the gemstone.
Clarity Grading
In terms of clarity grading, star rubies are typically evaluated based on their transparency and the visibility of any inclusions that may affect the asterism effect. While most gemstones are graded for their lack of inclusions or blemishes, in the case of star rubies, the presence of silk formations is actually desired as they contribute to the asterism effect. However, excessive silk or other inclusions that hinder transparency can lower the value of a star ruby.
Cut Grading
Cutting plays a crucial role in enhancing the visibility and beauty of the asterism effect in star rubies. Special cutting techniques are employed to ensure that the star phenomenon is well-centered and properly displayed on the surface of the gemstone.
Carat Weight
Carat weight also influences the value of a star ruby. Generally, larger star rubies are rarer and more valuable than smaller ones. However, it is important to note that gem-quality star rubies are usually very small and only a few carats large at most, due to the physical limitations imposed by chromium, which colors the rubies.
When grading and evaluating star rubies, factors such as color, clarity, cut, and carat weight are taken into consideration. The ideal star ruby exhibits a deep red color with a vibrant saturation, shows a visible asterism effect with well-centered stars, and has minimal inclusions that do not hinder transparency.
Natural and Synthetic Star Rubies
When it comes to star rubies, it’s important to understand the distinction between natural and synthetic varieties.
Natural Star Rubies
These are formed organically within the earth, undergoing a natural process that results in their unique asterism effect. Each natural star ruby is a one-of-a-kind creation, making them highly prized for their individuality and rarity.
Synthetic Star Rubies
These are created in controlled laboratory environments to mimic the appearance of natural star rubies. One common method used in producing synthetic star rubies is the diffusion process, where synthetic rutile needles are diffused into natural rubies or heating natural rubies with enough rutile needles to make the rutile recrystallize and show a star. While synthetic star rubies may closely resemble their natural counterparts, they lack the distinctiveness and value associated with genuine, naturally occurring star rubies.
The choice between owning a natural or synthetic star ruby comes with its own set of advantages and disadvantages:
Advantages of Natural Star Rubies:
- Uniqueness and rarity
- Valued for their organic formation
- Resilience against chemical treatments
Disadvantages of Natural Star Rubies:
- Higher cost due to scarcity
- Limited availability of large carat weights
Advantages of Synthetic Star Rubies:
- More affordable than natural star rubies
- Controlled production process ensures consistency in appearance
Disadvantages of Synthetic Star Rubies:
- Lack of individuality and rarity
- Lower market value compared to natural star rubies
Understanding the differences between these two types of star rubies can guide enthusiasts in making informed purchasing decisions.
These renowned star rubies each possess their own distinctive qualities and historical significance, contributing to the mystique surrounding these enchanting gems.
Buying and Caring Guide for Star Rubies
When purchasing a star ruby, it’s crucial to consider various factors to ensure you’re getting a genuine and high-quality gemstone:
Factors to consider when buying a star ruby
- Color: Look for a rich, deep red color with a bright and vivid appearance. The presence of purplish or brownish hues can diminish the stone’s value.
- Clarity: Inspect the gem for any visible imperfections or inclusions that may affect its overall beauty. Opt for a stone with minimal to no flaws that could interfere with the asterism effect.
- Cut: Seek well-proportioned cuts that maximize the visibility of the star effect. A symmetrical and centered star adds significant value to the gem.
- Asterism Effect Visibility: Examine the stone under different lighting conditions to ensure the star pattern is clearly visible from various angles.
Caring for your star ruby is essential to maintain its allure over time:
Tips for caring for your star ruby
- Gentle Cleaning: Use a soft brush or cloth with mild soapy water to clean your star ruby. Avoid harsh chemicals or ultrasonic cleaners that can damage the gem.
- Avoid Extreme Conditions: Protect your star ruby from sudden temperature changes, high heat, and prolonged exposure to direct sunlight to prevent damage.
- Secure Storage: Store your star ruby separately from other gemstones or jewelry pieces to prevent scratches. Consider wrapping it in a soft cloth or storing it in a jewelry box lined with fabric.
By following these tips, you can confidently select a stunning star ruby and ensure its longevity with proper care.
Star rubies have become synonymous with elegance and allure in the world of fashion. Designers continue to incorporate these captivating gemstones into their creations to add a touch of mystery and glamour. Celebrity endorsements on the red carpet further contribute to their popularity. Whether it’s a statement piece or a subtle accent, star ruby jewelry is sure to make a lasting impression.