SSEF report

An SSEF report is the grading credential issued by the Swiss Gemmological Institute (Schweizerische Stiftung für Edelstein-Forschung) in Basel, Switzerland. SSEF is one of two top-tier global authorities for colored gemstone origin and treatment determination (Gübelin Gem Lab is the other); its reports are accepted by Christie's, Sotheby's, Bonhams, and Phillips for high-value colored-stone lots and carry the most weight in the trade after Gübelin.

SSEF specialises in colored stones — sapphire, ruby, emerald, alexandrite, paraiba tourmaline, padparadscha, and other premium species. The lab issues full grading reports that include species identification, measurements, color description, treatment disclosure, and (when requested and supported by chemistry) country-of-origin determination. The origin call is based on LA-ICP-MS trace-element chemistry plus inclusion-fingerprint analysis plus FTIR spectroscopy; SSEF maintains one of the most extensive reference populations of confirmed-origin stones, which is what makes its origin calls authoritative.

The full SSEF report on a high-value lot includes: stone species (e.g., natural sapphire), variety (e.g., "no indications of heating" or "indications of heat treatment present"), color description (e.g., "vivid blue" or "cornflower blue"), country of origin call (e.g., "Sri Lanka," "Madagascar," "Kashmir"), measurements, and weight. For top lots, SSEF can issue an "Appendix Letter" — a supplementary document that explains the origin call's reasoning and discusses the stone's optical features in detail. The Appendix Letter is typically reserved for stones the lab considers exceptional.

SSEF uses specific color call language. "Cornflower blue" is reserved for stones that meet SSEF's internal reference standard for the Kashmir-type velvety medium-blue; "vivid blue" or "royal blue" for the deeper Mogok-type saturated blue; "pigeon blood" on ruby for the trade-standard pure red with slight blue undertone. The color calls carry independent pricing weight at auction — a stone with "pigeon blood" called by SSEF trades materially higher than a stone with the same visible color but no SSEF call.

SSEF also issues pearl reports (natural vs cultured pearl determination), diamond grading reports (less commonly than GIA), and specialty reports for jadeite, alexandrite, and color-change garnets. The pearl determination work is historically important — SSEF was a pioneer in X-ray pearl identification techniques.

The SSEF report number can be verified against the lab's online database. Buyers and sellers checking a stone's reported attributes against the SSEF database is the standard authenticity verification path for top-tier colored stones.

For ruby, sapphire, and emerald above approximately 3 carats with origin-or-color-call premium positioning, SSEF paper is the credential the market expects.