Natural emeralds, rubies, sapphires, and other gemstones.

When acquiring fine gemstones, understanding how laboratory reports function is essential. Laboratory reports—including those from prestigious institutions like the GIA, Gübelin, or SSEF—represent expert opinions based on current scientific testing, not absolute or indisputable facts.

1. Geographic Origin: An Expert Opinion, Not a Legal Guarantee

Geographic origin determinations are based on a laboratory comparing a gem's chemical trace elements and internal inclusions against their private reference database.

• Origin as an Opinion: A report stating a ruby is from "Burma" or a sapphire is from "Kashmir" is an expert interpretation. Nature does not stamp a gemstone with a country of origin; gems from neighboring tectonic regions often share identical physical traits.
• Laboratory Discrepancies: It is common for two top-tier laboratories to examine the exact same gemstone and reach different conclusions regarding its geographic origin.
• Our Inventory Policy: Origins listed on our site reflect either the independent laboratory's professional opinion stated on its certificate or our own expert gemological evaluation. They are provided as professional assessments to guide valuation, not as absolute factual declarations.

2. Emerald Oiling & Treatment Grading Differences

Practically all natural emeralds contain internal fractures (jardin). Filling these fractures with colorless oils or resins is a traditional industry practice to enhance optical clarity.

• Subjective Clarity Grading: Laboratories grade clarity enhancement levels on a relative scale (Insignificant, Minor, Moderate, Significant).
• Why Grades Vary: Because this evaluation depends heavily on the individual gemologist's subjective assessment under a microscope, one laboratory may grade an emerald as having "Minor" oil, while another laboratory may judge the same stone as "Moderate."
• Fluid Dynamics: Natural oils can seep out or dry over time during cleaning, transport, or climate shifts. An emerald certified as "Minor Oil" three years ago may receive a different grade if tested again today.

3. Heated vs. Unheated Rubies & Sapphires

Heat treatment is a traditional, permanent process that finishes what nature started by altering color and dissolving clouding inclusions.

Lab Interpretation: Determining whether a stone has undergone low-temperature heat treatment requires specialized spectroscopic tools. Like origin and oiling, "No Indications of Heating" reflects the laboratory's scientific opinion based on features visible at the time of testing.