Laboratory record
Stone Group Labs
A trade-only laboratory used in the United States for coloured stone testing and diamond verification.
The record
HeadquartersUnited States
Founded1999
Kind of bodyReport issuer
Country-of-origin opinionsNot stated
StatusIssuing reports
What it covers
DiamondColoured stone
Worth knowing
Founded in 1999 by Bear and Cara Williams. The current site names no report products and gives no address, so no city is recorded. It lists instrumentation including ED-XRF, FTIR, Raman and UV-Vis-NIR and describes these as aiding geographic origin work, but it does not state that the laboratory issues country-of-origin opinions. Report queries go through an enquiry form rather than an online lookup.
Compiled from stonegrouplabs.com, read on August 16, 2026.
We verify dealers, not stones. A laboratory report describes one stone on one date; it is not a guarantee of value, and it is not ours to stand behind.