We don't ask you to take our word for it. Every AsteraGems stone is tested and graded by an independent gemological laboratory before it's ever listed — so what's on the certificate is exactly what's in your hand.
Independent testing across everything we carry — graded for authenticity, treatment history, and quality before it reaches you.
Sapphires, rubies, emeralds, and every coloured stone we carry — tested for natural origin and any treatment history before listing.
Graded on the traditional 4Cs — cut, colour, clarity, and carat weight — with full disclosure of any enhancement.
Natural and cultured pearls graded for lustre, surface quality, and nacre thickness by an independent lab.
We work with independent labs, not our own in-house grading — so a certificate on an AsteraGems stone means the same thing it would anywhere else.
The Gemological Institute of America is a nonprofit authority that has spent nearly a century setting global standards for gemstone and diamond grading. Its introduction of the 4Cs and the International Diamond Grading System in the 1940s reshaped how diamonds are assessed worldwide, and its research and education programs remain a reference point for the trade.
gia.eduGübelin began in Lucerne, Switzerland as a watchmaking house, and expanded into gemstone analysis in the 1920s to evaluate the stones set into its own timepieces. Over more than a century, that sideline grew into one of the most respected names in gemological research, particularly for origin determination on coloured stones.
gubelin.comThe International Gemological Institute operates one of the largest independent laboratory networks for diamond and coloured gemstone certification, grading against a single global standard regardless of which lab location issues the report. Alongside the traditional 4Cs, IGI is known for emphasising a fifth factor — confidence in the report itself.
igi.orgGemResearch Swisslab was founded by Dr. Adolf Peretti and has built its reputation on origin determination for fine coloured stones — identifying which mine or region a sapphire, ruby, or emerald actually came from, and flagging treatments or synthetics along the way. It's a common reference lab for rarer and historically significant stones.
gemresearch.chEnter the certificate number from your AsteraGems report to verify it against our records.
Certificate lookup is being connected to our lab partners' records — this is a preview of how it will work.
New arrivals, birthstone drops, and sourcing notes — no more than twice a month.