Lab-Grown Diamonds FAQ

Yes. Lab-grown diamonds are real diamonds by every scientific, gemological, and regulatory measure. Here's the proof:

• Chemical composition: Pure crystallized carbon — identical to natural diamonds
• Crystal structure: Cubic crystal system — identical to natural diamonds
• Hardness: 10 on the Mohs scale — the hardest known material, identical to natural
• Refractive index: 2.417-2.419 — identical to natural diamonds
• Thermal conductivity: Identical — diamond testers will read "diamond" for both

The FTC (Federal Trade Commission) confirmed in 2018 that lab-grown diamonds are diamonds, updating their Jewelry Guides to define a diamond as "a mineral consisting essentially of pure carbon crystallized in the isometric system" — with no origin requirement.

Lab-grown diamonds should not be confused with diamond simulants like cubic zirconia (CZ) or moissanite, which are entirely different materials with different chemical compositions, hardness, and optical properties.

Lab-grown diamonds are created using two primary methods:

HPHT (High Pressure-High Temperature)

• Mimics the natural diamond formation process
• A small diamond seed is placed in a press with a carbon source (usually graphite)
• Exposed to ~2,700°F and ~1.5 million PSI
• Carbon atoms dissolve and crystallize onto the seed
• Growth time: 1-3 weeks depending on desired size
• Tends to produce diamonds with higher color saturation

CVD (Chemical Vapor Deposition)

• A thin diamond seed is placed in a sealed vacuum chamber
• The chamber is filled with carbon-rich gas (typically methane and hydrogen)
• Gas is heated to 1,400-2,300°F, breaking molecular bonds
• Carbon atoms deposit onto the seed crystal layer by layer
• Growth time: 2-4 weeks
• Currently the most common method for gem-quality diamonds

Current lab-grown diamond prices (VS2 clarity, G color, Excellent cut, round brilliant, IGI certified):

Source: TheDiamondPrice.com Diamond Price Index. Median prices from 500,000+ diamonds, updated daily. February 2026.

The savings percentage increases with carat size — at 3 carats, lab-grown saves $31,500 compared to natural. This makes lab-grown particularly attractive for buyers wanting larger stones.

Yes. Lab-grown diamonds are permanent and will last indefinitely. They will not cloud, fade, discolor, lose sparkle, or degrade in any way over time.

This is because lab-grown diamonds have the exact same physical properties as natural diamonds:

• Hardness: 10 on the Mohs scale — the hardest known material
• Scratch resistance: Only another diamond can scratch a diamond
• Chemical stability: Inert to acids, chemicals, and environmental exposure
• Heat resistance: Stable up to 1,292°F (700°C) in air

Not without specialized laboratory equipment. Lab-grown and natural diamonds are visually indistinguishable under all normal viewing conditions:

• Naked eye: No — identical sparkle, fire, and brilliance
• Jeweler's loupe (10x): No — similar inclusion types at each clarity grade
• Professional jeweler: No — cannot reliably distinguish without lab equipment
• Diamond tester: No — both read as "diamond" (same thermal conductivity)
• Specialized lab equipment: Yes — spectroscopy can detect growth patterns

Because they are indistinguishable by normal means, GIA and IGI laser-inscribe "Laboratory Grown" on the girdle (edge) of lab-grown diamonds along with the certificate number. This microscopic inscription is the only physical marker of origin.

Yes. Lab-grown diamonds are certified by the same major gemological laboratories that certify natural diamonds:

All certificates clearly state "Laboratory Grown" to distinguish from natural diamonds. Certification verifies the 4Cs, confirms origin, and protects you from misrepresentation.

Lab-grown diamonds have lower resale value than natural diamonds:

• Lab-grown resale: 10-20% of original purchase price
• Natural resale: 25-50% of original purchase price

The lower resale value is driven by:

• Unlimited supply: Lab-grown diamonds can be produced indefinitely, eliminating scarcity value
• Declining prices: New lab-grown diamonds cost 2-4% less each year, reducing the value of previously purchased stones
• Limited secondary market: Fewer buyback programs and resale channels compared to natural diamonds

Ethics: Lab-grown diamonds avoid the ethical concerns historically associated with diamond mining — conflict financing, unsafe labor conditions, and community displacement. There are no "conflict lab-grown diamonds."

Environment: The picture is more nuanced than marketing suggests:

• Water use: ~18 liters per carat (lab-grown) vs ~480 liters (mining) — lab-grown wins clearly
• Land impact: Minimal factory footprint vs open-pit mining disruption — lab-grown wins clearly
• Energy use: 250+ kWh per carat — lab-grown production is energy-intensive
• Carbon emissions: 26-511 kg CO2 per carat — varies enormously depending on electricity source

The best lab-grown diamond for most buyers combines these specs:

Most likely, yes. Lab-grown diamond prices have declined 2-4% annually over the past several years, and this trend is expected to continue due to:

• Increasing production capacity: New factories in India, China, and elsewhere are scaling rapidly
• Technology improvements: CVD and HPHT processes becoming more efficient
• Competition: More manufacturers entering the market
• Economies of scale: Higher volume = lower per-unit costs

However, the rate of decline may slow as the market matures and production costs approach a floor.