Moissanite vs Lab Grown Diamond: What's the Difference?

As the CEO of TianyuGems, a leading provider of custom jewelry and lab-grown diamonds, I often come across questions about the distinctions between moissanite and lab-grown diamonds. Understanding the nuances between these two exquisite gemstones is crucial, especially for those seeking the perfect choice for their jewelry needs.

The easiest way to tell the difference is to look at the color reflections: moissanite tends to emit a rainbow of color reflections, whereas artificially grown diamonds usually reflect less vibrant colors and more gray or off-white tones. As cutting and polishing techniques have been perfected, many moissanite factories have been able to cut moissanite in such a way as to reduce its fire and avoid double refraction, thus making it similar to a diamond,  which is very difficult to distinguish from the naked eye.

When it comes to strict discerning between moissanite and lab-grown diamonds, it's essential to delve into their unique properties and composition. While they may share some visual similarities, their chemical makeup and optical characteristics differ significantly.

Amid the dazzle and allure of these gemstones, how does one truly distinguish between moissanite and lab-grown diamonds? Let's explore.

Understanding the Composition

Moissanite, initially discovered in a meteor crater, is composed of silicon carbide, making it distinct from the carbon-based structure of diamonds. On the other hand, lab-grown diamonds share the same crystal structure and chemical composition as natural diamonds, ensuring they possess identical properties without the environmental impact of mining.

Visual Characteristics

When it comes to visual distinctions, keen observers can detect differences in brilliance and sparkle. While both gemstones exhibit exceptional brilliance, moissanite tends to disperse light differently, creating a captivating rainbow effect known as 'dispersion.' Lab-grown diamonds, however, boast a remarkable brilliance with a fiery sparkle that's unique to diamonds alone.

Examining Hardness and Durability

A key aspect often overlooked is the difference in hardness between moissanite and lab-grown diamonds. Despite being a durable gemstone, moissanite falls slightly short in terms of hardness compared to lab-grown diamonds. Assess the gemstones' position on the Mohs scale, which measures the relative hardness of minerals. Moissanite, with a rating of 9.25, is highly durable and resistant to scratches and abrasions. Comparatively, cultivated diamonds, ranking 10 on the Mohs scale, demonstrate exceptional resistance to surface damage, making them the hardest natural material. Understanding this disparity can help in making informed decisions, especially for those seeking long-lasting, enduring jewelry pieces. 

Why does a diamond test on a lab-grown diamond show moissanite?

The occurrence of a diamond tester indicating moissanite when applied to a lab-grown diamond can be attributed to the electrical conductivity of moissanite, which is similar to that of diamonds. Many conventional diamond testers utilize electrical conductivity as a key determinant in differentiating diamonds from other gemstones.

Lab-grown diamonds, while chemically identical to natural diamonds, may exhibit different electrical properties due to the specific manufacturing process they undergo. As a result, certain diamond testers, particularly those relying solely on electrical conductivity, may misinterpret the signals from lab-grown diamonds and erroneously identify them as moissanite.

To ensure accurate identification, especially in the case of lab-grown diamonds, it is recommended to employ advanced testing methods that consider a broader spectrum of properties, such as specialized spectroscopy or advanced gemological analysis. This approach helps to distinguish the unique characteristics and subtle differences between lab-grown diamonds and moissanite, ensuring precise and reliable identification for your business and customers.

Moissanite or Lab-Grown Diamond: Which is the Right Choice for You?

When it comes to selecting the perfect gemstone for your jewelry, it's crucial to understand the nuances between moissanite and lab-grown diamonds. Both options offer their unique set of qualities and characteristics, catering to varying preferences and priorities. Let's delve deeper into the distinctions between these two exquisite gemstones to help you make an informed decision based on your specific needs and preferences.

Moissanite: Exquisite Brilliance and Affordability

Moissanite is a stunning gemstone renowned for its exceptional brilliance and fire. Crafted from silicon carbide, it exhibits a remarkable sparkle that closely rivals that of natural diamonds. With its exceptional hardness and durability, moissanite is highly resistant to scratches, ensuring that your jewelry maintains its luster and beauty for years to come. One of the significant advantages of moissanite is its affordability, providing an elegant and cost-effective option without compromising on visual appeal or durability. Additionally, its synthetic nature makes it an environmentally friendly choice, contributing to sustainable practices within the jewelry industry.

Lab-Grown Diamonds: Timeless Elegance and Ethical Integrity

On the other hand, lab-grown diamonds offer a classic and timeless elegance that closely resembles that of natural diamonds. Created through advanced laboratory techniques, they possess identical physical, chemical, and optical properties to natural diamonds, making them virtually indistinguishable to the naked eye. With their remarkable hardness and resilience, lab-grown diamonds are suitable for everyday wear, ensuring that your jewelry remains stunning and radiant over time. Furthermore, their ethical production process eliminates concerns related to traditional diamond mining, promoting sustainability and responsible practices within the jewelry industry.

Choosing the Right Gemstone for You

When deciding between moissanite and lab-grown diamonds, consider your preferences, priorities, and values. If you seek an affordable yet equally stunning alternative to natural diamonds, moissanite might be the ideal choice for you. Its exceptional brilliance, durability, and environmental sustainability make it a popular option for those looking for an elegant and budget-friendly gemstone.

On the other hand, if you value the timeless elegance and ethical integrity associated with diamonds, lab-grown diamonds offer an excellent alternative. With their indistinguishable qualities from natural diamonds, they provide a sustainable and responsible option for those who prioritize ethical considerations without compromising on the exquisite beauty of a diamond.

Ultimately, the choice between moissanite and lab-grown diamonds depends on your individual preferences, budget, and ethical values. Both options offer exquisite beauty, durability, and ethical integrity, ensuring that your chosen piece of jewelry reflects your personal style and values. Whether you opt for the mesmerizing brilliance of moissanite or the timeless elegance of lab-grown diamonds, you can be confident in your choice, knowing that you've selected a gemstone that aligns with your specific needs and values.


In the realm of jewelry and gemstones, the distinction between moissanite and lab-grown diamonds lies in their unique compositions, optical properties, and overall appeal. While both offer exceptional beauty and allure, comprehending their differences enables you to make an informed decision that aligns with your preferences, budget, and ethical considerations. Whether you're a retailer, jeweler, or a discerning customer, understanding the nuances between these exquisite gemstones empowers you to curate jewelry pieces that exude timeless elegance and enduring beauty.

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