Sapphire is corundum — aluminium oxide with trace elements that create colour. Lab-grown sapphire is the same crystal, grown from a melt, and it grades 9 on the Mohs scale exactly like the mined stone.
What is identical
- Hardness (9) and toughness — suitable for daily-wear rings.
- Refractive index (1.76–1.77) and lustre.
- Response to heat and most cleaning methods.
What differs
Colour consistency. Natural sapphires vary in tone and saturation; matching a pair is work. Lab-grown stones can be produced in consistent runs, so a matched pair or a suite is easier and cheaper. That consistency is also how laboratories detect them — natural stones have zoning and inclusions that lab-grown ones lack.
Price. Lab-grown sapphire is a fraction of the natural price at the same size and colour. The gap is largest for “ideal” blue, where natural stones command a premium.
Certification. Natural sapphires are graded by laboratories such as GRS, AIGS or GIA, with origin reporting. Lab-grown sapphires are usually sold with a manufacturer's specification rather than an origin report.
The colour question
“Cornflower”, “royal blue” and “padparadscha” are trade descriptions, not standards. Ask for a photograph in daylight and a video under both daylight and incandescent light, because sapphire changes tone dramatically between the two.
Which to buy
- Lab-grown if you want a specific colour, a matched pair, or a large stone at a sensible price — and you accept that resale is limited.
- Natural if origin and rarity matter, and you are buying with a recognised report.
What we stock
Lab-grown sapphire in blue, pink, yellow and padparadscha tones, calibrated and matched in-house. We will send measurements and a daylight video before you commit. Lab-grown colour stones →
The people who cut the stones and set the rings. We publish what we can verify on our own bench, and link to the certificate or the guide when a number needs a source.
