How to tell a diamond from a moissanite

What is Moissanite?

Moissanite is a gemstone that was first discovered in 1893 by French scientist Henri Moissan in a meteor crater. Initially mistaken for diamonds, these silicon carbide crystals are incredibly rare in nature. Today, most moissanite used in engagement rings and other jewelry is lab-created.

While diamonds are composed of carbon, moissanite consists of silicon carbide, giving it distinct properties that differentiate it from diamonds. Despite these differences, moissanite has gained popularity for its diamond-like appearance and ethical production methods. Unlike natural diamonds which are mined from the earth, lab-created moissanite offers an eco-friendly alternative with minimal environmental impact.

The creation process of modern moissanite involves advanced technology that produces gemstones with exceptional clarity. Most commercially available moissanite is virtually flawless, unlike natural diamonds which often contain inclusions or blemishes. This consistent quality has made moissanite a desirable option for those seeking perfection in their gemstones.

At Espling Jewelers, we offer both traditional diamonds and moissanite options, understanding that each has unique qualities that appeal to different preferences and values.

Sparkle and Brilliance Differences

Perhaps the most noticeable difference between diamonds and moissanite lies in how they interact with light. Diamonds are known for their brilliance (white light reflection), while moissanite exhibits both brilliance and fire (colored light dispersion).

Moissanite has a higher refractive index than diamonds (2.65-2.69 compared to 2.42), which means it bends light more dramatically. This property gives moissanite more “fire” or rainbow flashes, especially in sunlight or bright indoor lighting. Some describe moissanite’s sparkle as more “disco ball-like” compared to the more subdued, classic sparkle of diamonds.

When examining wedding bands or engagement rings, this difference becomes particularly evident in larger stones (over 1 carat). Smaller moissanites may appear very similar to diamonds to the untrained eye, but larger stones will display more noticeable fire.

This distinctive brilliance can be either an advantage or disadvantage depending on personal preference. Some people are drawn to moissanite precisely because of its enhanced sparkle and fire, while others prefer the more traditional sparkle of diamonds. When visiting us at Espling Jewelers, we encourage customers to view both gemstones under different lighting conditions to appreciate these differences firsthand.

Color Variations

Another telling difference between diamonds and moissanite is their color appearance. Traditional diamonds are graded on a color scale from D (completely colorless) to Z (light yellow or brown). High-quality diamonds used in fine engagement rings typically fall in the colorless (D-F) or near-colorless (G-J) range.

Modern moissanite has come a long way in terms of color. Early moissanite often had a yellowish or grayish tint, but today’s premium moissanite is available in “colorless” grades that closely resemble high-grade diamonds. However, some moissanite may still display a slight yellow, gray, or green tint, particularly in larger sizes or under certain lighting conditions.

One distinctive characteristic of moissanite is that it can sometimes display a “rainbow effect” or slight color shift. This is most noticeable in bright, direct sunlight or under fluorescent lighting. While examining stones at Espling Jewelers, we recommend viewing them under various lighting conditions to detect these subtle color differences.

For those particularly concerned about color, it’s worth noting that lab diamonds offer another alternative that maintains the same chemical composition as natural diamonds but can be more affordable while still providing excellent color consistency.

Durability and Hardness

When investing in jewelry pieces like wedding bands or engagement rings, durability is a crucial consideration. Both diamonds and moissanite are exceptionally durable gemstones, but there are slight differences worth noting.

Diamonds rank 10 on the Mohs scale of hardness, making them the hardest natural substance on earth. This extraordinary hardness means they resist scratching extremely well, which is ideal for everyday wear in rings and bracelets.

Moissanite ranks 9.25-9.5 on the Mohs scale, making it the second hardest gemstone used in jewelry, surpassing traditional alternatives like sapphires (9) and much harder than emeralds (7.5-8). In practical terms, moissanite is highly resistant to scratching and suitable for daily wear.

However, hardness isn’t the only factor in durability. Diamonds, while extremely hard, can chip if struck at certain angles because of their cleavage planes. Moissanite doesn’t have these cleavage planes, potentially making it less prone to chipping. Both stones are heat-resistant, though diamonds can burn at extremely high temperatures (around 1562°F or 850°C), while moissanite can withstand even higher temperatures.

At Espling Jewelers, we assure our customers that both options offer excellent durability for lifelong wear, with proper care and occasional professional cleaning.

Weight Differences

One of the most reliable methods to distinguish between diamonds and moissanite is by weight. Moissanite is approximately 15% lighter than diamonds of equivalent size. This means that a moissanite will weigh less than a diamond of identical dimensions.

Diamonds are measured in carats, a unit of weight equal to 0.2 grams. Due to the density difference, a 1-carat diamond and a 1-carat moissanite would not be the same size – the moissanite would actually appear larger. This is why moissanite is typically sold by millimeter size rather than carat weight, to avoid confusion.

This weight difference can be both an advantage and a consideration. For those who want maximum visual impact for their budget, moissanite offers more size per dollar. A 6.5mm moissanite (equivalent to a 1-carat diamond in appearance) might cost significantly less than a 1-carat diamond.

When shopping for estate earrings or other fine jewelry, understanding this size-to-weight relationship helps you make better comparisons. At Espling Jewelers, our experts can help you understand how these differences might impact your jewelry selection, whether you’re considering natural diamonds or alternatives.

Price Comparison

Perhaps the most significant difference for many consumers is the price point. Moissanite typically costs about 10-15% of the price of a comparable diamond, making it an attractive option for those seeking maximum value or larger stone sizes within their budget.

For perspective, a high-quality 1-carat diamond in an engagement ring might cost several thousand dollars, while a similar-sized moissanite could cost a few hundred dollars. This dramatic price difference is one of the main reasons moissanite has gained popularity, especially among younger buyers or those with other financial priorities.

It’s important to note that while natural diamonds typically hold some resale value, moissanite generally has limited resale potential. However, many consumers view their purchase as a lifestyle choice rather than an investment, prioritizing the stone’s beauty and ethical considerations over potential future value.

For those seeking a middle ground, lab diamond jewelry offers another alternative, typically costing about 30-40% less than natural diamonds while maintaining the same physical, chemical, and optical properties.

At Espling Jewelers, we offer transparent pricing across our gemstone options, ensuring our customers understand the value proposition of each choice.

Professional and At-Home Testing Methods

If you’re trying to determine whether a stone is a diamond or moissanite, several testing methods can help. Professional jewelers like us at Espling Jewelers use specialized equipment for definitive identification.

Diamond testers that measure thermal conductivity were once reliable, but modern moissanite can sometimes pass these tests because both gems conduct heat well. Today, professional jewelers use electrical conductivity testers specifically designed to distinguish between diamonds and moissanite. Moissanite conducts electricity, while diamonds do not.

Under magnification, professionals might look for “doubling” in moissanite. When viewed through a jeweler’s loupe at the facet junctions, moissanite sometimes shows doubled facet lines due to its doubly refractive nature, while diamonds are singly refractive.

For at-home methods, the “breath test” offers a simple approach. Breathe a small fog onto the stone – diamonds disperse heat quickly, so the fog disappears almost immediately, while moissanite holds the fog slightly longer. However, this method isn’t foolproof and works best with clean stones.

Another observation is the sparkle pattern. In dimmer lighting, observe the colors reflected. Diamonds primarily reflect white light (brilliance), while moissanite displays more rainbow flashes (fire). This difference is particularly noticeable in larger stones.

If you’re examining estate earrings or other jewelry where you’re uncertain about the stones, we recommend bringing them to a professional jeweler like Espling Jewelers for definitive testing.

Making the Right Choice for You

Choosing between diamond and moissanite ultimately comes down to personal values, preferences, and budget considerations. Neither choice is inherently better than the other – they simply offer different benefits that may align differently with individual priorities.

Consider diamonds if: You value tradition and natural origins; you appreciate the subtle, classic sparkle pattern; you’re viewing the purchase partly as an investment; or you specifically want the hardest gemstone available for your wedding bands or other jewelry.

Consider moissanite if: You prioritize maximum visual impact for your budget; you’re drawn to its enhanced fire and brilliance; ethical and environmental considerations are important to you; or you prefer to allocate your budget to other priorities while still enjoying a beautiful, durable gemstone.

Many couples today are also choosing lab diamond jewelry as a middle-ground option that offers the identical composition of natural diamonds with ethical sourcing guarantees and a more accessible price point.

At Espling Jewelers, we believe in providing options and education rather than steering customers toward any particular choice. We offer high-quality natural diamonds, lab-grown diamonds, and moissanite options across our collection of engagement rings, wedding bands, and other fine jewelry.

We invite you to visit our showroom to compare these beautiful gemstones side-by-side, ask questions, and discover which option resonates most with your personal style and values. Whichever you choose, our commitment to quality craftsmanship ensures your jewelry will be treasured for generations.