If you are shopping for sapphire jewelry, one of the first decisions you will face is whether to choose a natural or lab-created stone. Both are real sapphires with the same chemical composition, but they come from very different places and have distinct characteristics worth understanding before you buy. This guide covers the practical differences between natural and lab-created sapphires, what to look for in each, and how to decide which is right for you.
Natural and Lab-Created Sapphires: What They Have in Common
Natural and lab-created sapphires are both corundum minerals (aluminum oxide, Al2O3) with the same source of blue color: trace amounts of iron and titanium. They share the same hardness (9 on the Mohs scale), the same refractive index, and the same crystal structure. A lab-created sapphire is not a simulant or imitation; it is a real sapphire grown in a controlled environment rather than mined from the earth. Both are September birthstones.
How Natural Sapphires Form
Natural sapphires form deep within the earth's crust under conditions of intense heat and pressure over millions of years. The world's most significant deposits are in Kashmir (India), Burma (Myanmar), Sri Lanka, and Madagascar, though Montana in the United States also produces distinctive sapphires prized for their cornflower blue and pastel tones.
Because the conditions required to produce fine blue sapphire are rare, high-quality natural stones are scarce — a factor that drives their price significantly above lab-created alternatives. Most natural blue sapphires on the market are heat-treated to improve color and clarity. This is an industry-standard practice that is permanent, widely accepted, and disclosed by reputable jewelers. Untreated natural sapphires exist but are considerably rarer and command a significant premium.
Natural sapphires typically contain inclusions — tiny internal features formed during growth. Common inclusions in sapphire include needle-like rutile crystals (called "silk"), fingerprint patterns, and growth zoning. Unlike diamonds, where eye-clean stones are standard, sapphire inclusions are widely accepted as long as they do not affect the stone's structural integrity or significantly reduce transparency.
How Lab-Created Sapphires Are Made
Lab-created sapphires are most commonly produced using the Verneuil process (also called flame fusion), developed in the early 1900s. In this method, aluminum oxide powder is melted in a high-temperature flame and allowed to crystallize onto a seed crystal, producing a boule — a teardrop-shaped crystal that is then cut and faceted.
More recently, the hydrothermal process has been used to grow sapphires that more closely replicate the conditions of natural formation, producing stones with slightly different internal characteristics. Both methods yield sapphires that are chemically and structurally identical to natural sapphires. The key visual difference: lab-created sapphires typically have few or no inclusions, and their color tends to be more uniform and consistent than natural stones.
Five Differences That Matter When Buying
1. Inclusions and Character
Natural sapphires often contain silk, fingerprint inclusions, or color zoning — features
that gemologists use to identify origin and confirm natural status. Lab-created sapphires
have few or no inclusions, resulting in a cleaner, more uniform appearance. If a stone
with visible character appeals to you, natural delivers that. If a clean, consistent look
is the priority, lab-created is the way to go.
2. Color
Natural sapphires display a range of blues influenced by origin: Kashmir sapphires are
famous for a velvety, slightly violet blue; Burmese stones tend toward a rich royal blue;
Sri Lankan sapphires often run lighter and more pastel. Lab-created sapphires produce a
consistent, saturated blue without the geographic variation. Neither is inherently better
— it depends on whether you value depth and complexity or clean uniformity.
3. Price
Lab-created sapphires cost significantly less than natural sapphires of comparable size
and color. A fine natural blue sapphire's price reflects rarity, origin, and the cost of
mining and sorting. Lab-created stones remove those variables entirely. For everyday
jewelry or gifts where budget matters, lab-created sapphires offer strong value. For
heirloom or investment pieces — particularly the 5th or 45th anniversary — natural
sapphires hold their value better over time.
4. Durability
Both natural and lab-created sapphires rate 9 on the Mohs hardness scale, second only to
diamond. Their scratch resistance is identical. Unlike emerald, sapphire is generally
safe for ultrasonic cleaners, though heat-treated stones should be cleaned with mild soap
and water to avoid disturbing any filler in surface-reaching fractures. Either way,
sapphire is one of the most durable gemstones for everyday wear.
5. Treatments
Most natural blue sapphires are heat-treated to improve color and clarity. This is
standard and accepted throughout the industry. A small percentage of natural sapphires
are sold untreated — these carry a premium and typically come with a gemological
certificate confirming no heat treatment. Lab-created sapphires do not require treatment
because their color is consistent from production. Reputable jewelers disclose treatment
status on all stones.
How to Tell Them Apart
To the naked eye, a high-quality lab-created sapphire and a natural sapphire can look virtually identical. A trained gemologist can distinguish them using magnification and spectroscopy. Key indicators include growth patterns (natural sapphires show silk inclusions, fingerprint features, and color zoning; lab-created Verneuil stones show curved growth lines and gas bubbles), along with the type and distribution of inclusions.
For buyers, the most reliable approach is to purchase from a jeweler who clearly labels each stone. At Erin Gallagher Jewelry, our product listings specify "Sapphire-Nat" for natural and "Sapphire-Lab" for lab-created, so there is no guessing involved.
Which Should You Choose?
There is no wrong answer. Both are real sapphires. Here is a practical framework:
Choose natural if:
- You value organic character — silk inclusions, color variation, geographic origin.
- You want a stone with a documented natural formation history.
- You are buying a milestone piece: the 5th or 45th anniversary, an engagement ring, or an heirloom.
- Long-term value retention matters to you.
Choose lab-created if:
- You want a clean, consistent blue with few or no inclusions.
- Budget is a factor and you want the most stone for your money.
- You are buying for everyday wear and want peace of mind about durability.
- You prefer a more controlled production process over mining.
Caring for Your Sapphire Jewelry
Sapphire is one of the easiest fine gemstones to care for. At Mohs 9, it resists scratching from most everyday contact. Clean with mild dish soap and warm water using a soft brush — this works for both natural and lab-created stones. Most sapphire jewelry is safe for ultrasonic cleaners, but if your natural sapphire has been fracture-filled (not standard heat treatment, but an additional treatment sometimes applied to heavily included stones), use only gentle hand-cleaning to avoid disturbing the filler.
Remove sapphire jewelry before heavy physical activity or contact sports — at Mohs 9, sapphire resists scratching but can chip from a hard, direct impact. Store separately from diamond jewelry, which can scratch most other stones but cannot scratch sapphire.
Shopping for Sapphire Jewelry at Erin Gallagher
Every piece of sapphire jewelry in our collection is handcrafted in Steamboat Springs, Colorado using natural and lab-created sapphires set in 14K gold, gold-fill, or recycled sterling silver. We offer both options across necklaces, earrings, bracelets, rings, and charms, with prices starting at $20. Every order ships gift-ready, and orders over $150 ship free.
Ready to shop? Browse our full September birthstone jewelry collection, including sapphire necklaces, earrings, bracelets, rings, and charms from $20.
Shop sapphire jewelry | Learn more about sapphire | September birthstone collection | Design your own at the GemBar
For stone-specific buying guides and care instructions, visit our Birthstone Guides resource.