5

Credibility

lab can confirm not only the colour, clarity, weight and dimensions, but also its origin and any artificial treatments to which it might have been subjected. Reputable laboratories that issue such certifications are the Gemmological Institute of America (GIA), the Gübelin Gem Lab, the Gemresearch Swisslab, the SSEF Swiss Gemmological Institute and the American Gemmological Laboratories. Know your supplier well and enquire about where the emerald was sourced—in essence,