Walk into any jewelry store today and you’ll likely be offered a choice that didn’t exist a generation ago: a natural gemstone, formed deep within the earth over millions of years, or a lab-created gemstone, grown in a matter of weeks inside a controlled facility. Both sparkle. Both can be cut into stunning stones. Both are, chemically and structurally, the “real thing.” Yet the two categories couldn’t be more different in how they come to exist, what they cost, and what they mean to the person wearing them.
As lab-grown diamonds, sapphires, rubies, and emeralds become increasingly common — and increasingly indistinguishable from their natural counterparts to the naked eye — buyers are asking more questions than ever. Is a lab-created stone “fake”? Does it hold its value? Is it more ethical? This article breaks down exactly what separates natural and lab-created gemstones, so you can make an informed decision the next time you shop for jewelry.
What Is a Natural Gemstone?
Natural gemstones form through geological processes that unfold over thousands to millions of years. Diamonds, for instance, crystallize from carbon under immense heat and pressure roughly 100 miles beneath the earth’s surface, then get carried to the surface through volcanic eruptions. Sapphires and rubies (both varieties of the mineral corundum) form in metamorphic or igneous rock, where trace elements like chromium or iron and titanium give them their signature colors. Emeralds develop when beryllium-rich fluids interact with rocks containing chromium or vanadium, typically in hydrothermal veins.
Because these processes depend on rare combinations of chemistry, heat, pressure, and time, natural gemstones are scarce by definition. Mining them is a labor- and capital-intensive process that often involves digging through tons of rock to find a single carat of usable material. This scarcity, combined with the romance of a stone that predates human civilization, is central to why natural gemstones carry the value and mystique they do.
What Is a Lab-Created Gemstone?
Lab-created gemstones — also called synthetic, cultured, or lab-grown gemstones — are produced in controlled environments that replicate the natural conditions under which gemstones form, but on a dramatically compressed timeline. Instead of waiting millions of years, technicians can grow a gem-quality crystal in weeks or months.
There are several methods used depending on the gemstone:
- High Pressure, High Temperature (HPHT): Used primarily for diamonds, this method subjects a small diamond seed to extreme pressure and heat, mimicking the earth’s mantle conditions, causing carbon to crystallize around the seed.
- Chemical Vapor Deposition (CVD): Also used for diamonds, this process involves placing a diamond seed in a chamber filled with carbon-rich gas. The gas is ionized, causing carbon atoms to deposit onto the seed layer by layer.
- Flux Growth and Flame Fusion: Common for sapphires, rubies, and emeralds, these methods dissolve the necessary chemical ingredients in a molten flux or melt them at high temperature, then allow crystals to grow slowly as the material cools.
- Hydrothermal Growth: Often used for emeralds and quartz, this method replicates the natural hydrothermal conditions in which these stones form, using heated, pressurized water solutions.
The result is a stone with the same chemical composition, crystal structure, and optical properties as its natural counterpart. This is a critical distinction: lab-created gemstones are not the same as imitation or simulant stones, like cubic zirconia (which mimics a diamond’s appearance but has an entirely different chemical makeup) or glass. A lab-created ruby is still corundum with chromium impurities — it’s real ruby, just grown by humans rather than by geology.
Are Lab-Created Gemstones “Real”?
This is where a lot of confusion comes from. Gemological organizations, including the Gemological Institute of America (GIA) and the Federal Trade Commission (FTC) in the United States, classify lab-created gemstones as genuine gemstones, not fakes or imitations. The FTC’s Jewelry Guides explicitly state that a lab-grown diamond has “essentially the same optical, physical, and chemical properties as a mined diamond.” The only legal requirement is that sellers must disclose whether a stone is natural or lab-created, since the two are not the same product from a market and value standpoint.
So while a lab-created sapphire is a genuine sapphire in every scientific sense, it is not equivalent to a natural sapphire in terms of rarity, geological history, or, in most cases, resale value.
Visual and Physical Differences
To the naked eye, and even to many trained jewelers using standard tools, natural and lab-created gemstones of the same type are visually identical. Both refract light the same way, exhibit the same hardness on the Mohs scale, and can be cut and polished using identical techniques.
However, subtle differences often exist beneath the surface:
Inclusions: Natural gemstones typically contain inclusions — tiny mineral crystals, fractures, or growth patterns — that formed as the stone developed underground. These inclusions are like a fingerprint of the stone’s specific geological journey and can include things like other mineral crystals, “silk” (fine needle-like inclusions), or negative crystals. Lab-created stones, by contrast, often show different inclusion patterns, such as metallic flux residue, curved striations that don’t occur in nature, or gas bubbles, depending on the growth method.
Trace Elements: Because natural stones form from whatever minerals happen to be present in a specific geological environment, they often contain a wider and more unpredictable range of trace elements. Lab-created stones are grown from more controlled and often purer ingredients, leading to more uniform trace element profiles.
Growth Patterns: Under magnification, natural crystals often show irregular, organic growth zoning, while lab-created crystals frequently display more geometric, repetitive growth patterns tied to the specific method used to grow them.
Distinguishing between the two usually requires specialized equipment: spectroscopy, microscopic examination for specific inclusion types, and sometimes UV fluorescence testing. This is why reputable jewelers rely on gemological certification, especially for diamonds, to confirm origin.
Price and Value Differences
This is often the most practical difference for shoppers. Lab-created gemstones are typically 30% to 90% less expensive than natural stones of comparable size, color, and clarity, depending on the gem type. Diamonds in particular have seen this gap widen significantly as lab-grown diamond production has scaled up; some lab-created diamonds now sell for a fraction of the price of natural stones with equivalent specifications.
The reason comes down to supply and manufacturing economics. Natural gemstones require exploration, mining infrastructure, extraction, and sorting — processes that are expensive, time-consuming, and yield a limited, unpredictable supply. Lab-created stones can be manufactured on demand in facilities that scale production up or down based on market needs, without the geological lottery involved in finding natural deposits.
This pricing difference also affects long-term value. Natural gemstones, particularly high-quality diamonds, sapphires, rubies, and emeralds, have historically held or appreciated in value over time, especially for rare colors or exceptional clarity. Lab-created stones, because they can be produced continuously and are not limited by natural scarcity, generally do not appreciate in value the same way and may not hold strong resale value. If you’re purchasing a gemstone purely as a long-term investment, this is an important consideration.
Ethical and Environmental Considerations
Ethical sourcing has become a major factor in gemstone buying decisions, particularly since the “blood diamond” controversies of the late 1990s and 2000s brought attention to conflict diamonds funding violence in parts of Africa. The Kimberley Process, an international certification scheme, was established in 2003 to curb the trade of conflict diamonds, and most major retailers now source from certified conflict-free supply chains.
That said, mining of any kind carries environmental costs: land disturbance, water usage, and energy consumption. Large-scale gemstone mining can also raise concerns about labor practices, especially in regions with less regulatory oversight.
Lab-created gemstones are often marketed as the more ethical and environmentally friendly choice, since they eliminate the risks associated with mining, including habitat destruction and labor exploitation. However, this isn’t a clean-cut win either. Growing gemstones, particularly diamonds via HPHT or CVD methods, requires significant energy input to sustain the necessary heat and pressure conditions, and the environmental footprint depends heavily on the energy source powering the facility. Some producers now use renewable energy to grow stones, which meaningfully reduces this footprint, but this varies by manufacturer.
Ultimately, neither option is universally “greener” or more ethical in every case. Buyers who care about this dimension should look into a specific brand’s sourcing practices, certifications, and energy use rather than assuming lab-created automatically means more sustainable.
Durability and Everyday Wear
Because lab-created gemstones share the same crystal structure and hardness as natural stones, they perform identically in terms of durability. A lab-created diamond scores the same 10 on the Mohs hardness scale as a natural diamond. A lab-created sapphire is just as resistant to scratching as a natural one. For everyday wear — an engagement ring, a pair of earrings, a bracelet worn daily — there is no meaningful difference in how well the stone will hold up over decades of use.
Certification: How to Know What You’re Buying
Because natural and lab-created gemstones can be visually indistinguishable, certification from an accredited gemological laboratory is the most reliable way to confirm what you’re purchasing. Organizations such as GIA, the American Gem Society (AGS), and the International Gemological Institute (IGI) issue certificates that specify whether a stone is natural or lab-created, along with details on cut, color, clarity, and carat weight.
Reputable jewelers will always disclose a stone’s origin and provide certification, particularly for diamonds. If a deal seems significantly cheaper than market rates for a “natural” stone with no certification offered, that’s a red flag worth investigating further.
Which Should You Choose?
The right choice ultimately depends on your priorities:
- Choose natural gemstones if you value rarity, geological history, long-term resale potential, and the traditional prestige associated with mined stones. Natural stones make sense for heirloom pieces, investment purchases, or when the emotional significance of a stone tied to the earth’s deep history matters to you.
- Choose lab-created gemstones if you want a larger, higher-clarity stone for a lower price, prefer a potentially more traceable supply chain, or simply don’t prioritize resale value and rarity. Lab-created stones are an excellent option for those who want the beauty and durability of a genuine gemstone without the premium price tag attached to natural rarity.
Neither option is objectively “better” — they simply serve different priorities. What matters most is that you understand exactly what you’re buying, that the seller provides proper certification and disclosure, and that the choice aligns with your budget, values, and expectations for the piece.
Final Thoughts
The rise of lab-created gemstones has fundamentally changed the jewelry industry, giving consumers more choice and better access to beautiful, genuine stones at a range of price points. Whether you choose a natural gemstone forged over millions of years or a lab-created stone grown in a matter of weeks, both are authentic gemstones with real chemical and physical properties; the differences lie in origin, rarity, price, and the story behind the stone. Understanding these distinctions ensures that whatever you choose, you’re making a purchase that fits your values, your budget, and the meaning you want the piece to carry.