Natural vs Lab-Created Gemstones: Complete Guide to Differences, Value & Identification
Lab-created gemstones — also called synthetic, laboratory-grown, or cultured gemstones — are chemically and physically identical to their natural counterparts. A lab sapphire and a natural sapphire are both aluminum oxide (corundum) with the same hardness, refractive index, and optical properties. But they are not the same product, and they are not worth the same amount.
Understanding the differences helps buyers make informed decisions and avoid paying natural prices for laboratory-created material.
What Makes a Gemstone “Natural”
A natural gemstone formed through geological processes over millions of years, without human intervention. Natural sapphires formed when aluminum-rich fluids crystallized under extreme pressure and temperature in metamorphic or igneous environments. The process is slow, localized, and produces material with unique characteristics — inclusions, color zoning, trace elements from the specific geological environment — that cannot be perfectly replicated in a laboratory.
Natural gemstones are finite resources. Fine natural rubies, sapphires, and emeralds of exceptional quality are genuinely scarce — and scarcity drives value.
How Lab-Created Gemstones Are Made
Flame fusion (Verneuil): The oldest and cheapest method. Aluminum oxide powder is melted in a flame and crystallizes on a rotating rod. Produces large, inclusion-free sapphires and rubies rapidly. Used for watch crystals, industrial abrasives, and low-cost jewelry stones.
Hydrothermal: Simulates natural growth conditions. Dissolved minerals crystallize on seed crystals in high-pressure autoclaves. Produces more realistic-looking stones with some inclusions but still identifiable by characteristic curved growth features.
Flux: Minerals dissolved in a molten flux crystallize slowly at lower temperatures. Produces very convincing material — some flux-grown rubies were accepted as natural in the 1970s before testing methods improved.
| Feature | Natural Gemstone | Lab-Created Gemstone |
|---|---|---|
| Origin | Formed in the earth over millions of years | Grown in a laboratory in weeks to months |
| Chemical & physical properties | Same as the natural species | Essentially identical to the natural species |
| Inclusions | Natural inclusions; unique to each stone | Often cleaner or with tell-tale lab growth features |
| Rarity | Finite and geologically rare | Reproducible on demand |
| Value & investment | Holds and can appreciate in value | Low resale value; priced as a manufactured good |
| Detection | Confirmed by gemological lab report | Lab identifies growth method and synthetic origin |
| Best for | Investment, heirlooms, certified collecting | Budget-conscious decorative jewelry |
Value: Why Natural Gemstones Cost More
Lab sapphires sell for $5–$50 per carat. Natural sapphires of comparable visual quality sell for $100–$5,000+ per carat. The price difference is not based on appearance — it is based on rarity, formation, and market demand. Natural gemstones retain and often appreciate in value. Lab-created stones depreciate rapidly as production technology improves and supply increases.
A 2-carat natural Kashmir sapphire purchased at $8,000 per carat in 2010 might be worth $25,000+ per carat today. A 2-carat lab sapphire purchased at $30 has not appreciated — and the same quality is now available for $15 per carat.
How to Tell Natural from Lab-Created
Reliable identification requires a gemological laboratory. GIA, GRS, IGI, GFCO, AIG and other major labs test every stone with a combination of microscopy (inclusion analysis) and spectroscopy (UV-Vis, photoluminescence, FTIR). The certificate will clearly state “Natural” or “Synthetic/Laboratory-grown” — never purchase a high-value colored gemstone without a certificate from a recognized independent lab.
Warning signs that may indicate synthetic material: a suspiciously low price for the stated quality, no inclusions visible under magnification in a large stone, a certificate from an unknown or house laboratory, or a seller who cannot or will not provide independent certification.
What is the difference between a natural and a lab-created gemstone?
A natural gemstone forms in the earth over millions of years, while a lab-created stone is grown in a laboratory in weeks to months. They share the same chemical and physical properties, but only the natural stone is geologically rare.
Are lab-created gemstones real gemstones?
Yes, in the sense that they have the same composition and crystal structure as their natural counterparts. They are real, but they are synthetic rather than natural, and a laboratory can identify their lab-grown origin.
Why do natural gemstones cost more than lab-created ones?
Natural gemstones are finite and rare, formed by geological processes that cannot be repeated. Lab-created stones can be produced on demand, so they cost far less and hold little resale value.
Can you tell a natural gemstone from a lab-created one?
Not reliably by eye. Gemologists examine inclusions and growth features under magnification and use spectroscopy. A laboratory report is the only dependable way to confirm whether a stone is natural or synthetic.
Do lab-created gemstones hold their value?
Generally no. Because they can be reproduced at scale, lab-created gemstones are priced as a manufactured product and have low resale value, whereas fine natural gemstones can appreciate over time.
Natural Certified Gemstones at MYGEMSET
Every gemstone sold at MYGEMSET is natural — certified by GRS, GIA, GFCO, IGI, or equivalent independent laboratories confirming “Natural” status. We do not sell synthetic or laboratory-created gemstones. All certificates are provided as high-resolution scans with report numbers available for independent verification before purchase.