Why can two gemstones of identical size have very different weights? Explore gemstone specific gravity, Archimedes’ principle, hydrostatic weighing, practical measurement errors and the role density plays in professional gemmological identification.
Natural, synthetic, treated, imitation and composite gemstones are fundamentally different categories. Learn what each term actually means, how laboratory-grown gems are created, and how gemmologists distinguish them.
Can a laboratory really determine whether a sapphire came from Sri Lanka, Madagascar or Myanmar? Discover how inclusions, spectroscopy, trace-element chemistry and known-origin reference stones are combined—and why some results must remain inconclusive.
Inclusions are more than imperfections. Mineral crystals, fluids, negative crystals, rutile silk, fingerprints and growth features can preserve evidence of how a gemstone formed, whether it was treated and sometimes where it may have originated.
A refractometer, microscope and spectroscope can answer many gemstone questions—but not all of them. Explore how modern laboratories use Raman, FTIR, UV-Vis-NIR, photoluminescence, XRF and LA-ICP-MS to investigate identity, treatments, synthetics and geographic origin.
Four sapphires can share essentially the same RI, SG and optical character yet have radically different histories and values. Follow an advanced evidence-based workshop separating natural unheated, heated, synthetic and diffusion-treated sapphire.
Gemstone inclusions are far more than imperfections. Mineral crystals, fluid inclusions, needles, healed fractures and growth structures can preserve evidence of how a gemstone formed, whether it was treated or laboratory-grown, and sometimes where it originated.
Many natural emeralds contain surface-reaching fissures that can be made less visible with oils, resins or other transparent fillers. Discover how clarity enhancement works, how laboratories detect and classify it, and what treatment means for value, care and disclosure.
Emerald is far more than green beryl. Explore its chromium and vanadium colour, characteristic inclusions, Colombian and Zambian geology, clarity enhancement, synthetic emerald and modern laboratory identification
Not all treated rubies are treated in the same way. Discover how conventional heating changes ruby, how flux can partially heal fractures, why glass filling is fundamentally different, and how gemmologists detect these treatments.
