GIA
Gemological Institute of America
Grades cut, color, and clarity on the scales most buyers already recognize. Report numbers are searchable directly in their public database, which makes a stone easy to verify before it is set.
A grading report is only useful if you know who issued it and what they actually measured. These are the independent laboratories and certification bodies whose documents travel with the stones and finished pieces we handle. We do not issue reports ourselves, and no lab pays for a place on this list.
Gemological Institute of America
Grades cut, color, and clarity on the scales most buyers already recognize. Report numbers are searchable directly in their public database, which makes a stone easy to verify before it is set.
International Gemological Institute
Issues reports for both loose and mounted stones, including lab-grown material. Useful when a stone is graded after setting, since the document notes the mounting.
Hoge Raad voor Diamant
A European laboratory whose reports are common on stones sourced through Antwerp. Cut grading is detailed, with separate comments on polish and symmetry.
Gem Certification & Assurance Lab
Known for light-performance imaging alongside the standard grades. Helpful if you want to see how a stone behaves under different lighting before deciding.
Sarine Technologies
Produces light-behavior and symmetry analysis used by several labs. The output is technical, but it is a useful cross-check when comparing two stones of similar grade.
Producer documentation
Not a grading body, but the traceability sheet that identifies where a lab-grown stone was produced. It travels with the commission file alongside the grading report.
If a stone arrives without a matching certificate number, we say so before anything is set. You can read a report alongside us during a fitting in Palermo, or ask for a copy of the document with your quote.
A diamond can look identical to another one across the counter. What separates them is the record that travels with each stone: who grew it, who graded it, and whether the certificate number actually matches the piece in front of you. On this page we explain how that chain of documents works, so you can hold a report and a stone side by side and follow along.
Every lab-grown stone we work with carries a record of the facility that produced it. That record names the growth method and the origin, which is the first thing to check before comparing two stones that look the same.
Independent labs grade cut, color, and clarity on the same scales used for mined stones. We walk through each field with you, including the polish, symmetry, and fluorescence notes that are easy to skip over.
A certificate is only useful if the number on the paper is the number on the stone. We check that match in front of you, both for a loose stone and for a finished piece, before anything is set.
When you commission a piece, the growth lab record and the grading report stay with the order from stone selection through CAD modeling and setting. Nothing gets separated from the stone it describes, so the file you receive at the end reflects the stone you actually chose.
A loose stone is easier to inspect because nothing blocks the view. Once it is set, the same report still applies, but the mount can hide a girdle or a small inclusion. That is why we compare the two states together and note what changes once the stone is in the ring.
If you want to go deeper into the four Cs before a fitting, our written guides cover grading reports and stone selection in plain language. For questions about a specific document, the studio team can walk through it with you in person or by email.