Challenge Tracks
Structured study with staged mastery: work through a themed sequence of quiz stages, each one unlocking only once you pass the last. Progress is saved locally in your browser.
Gem Chemistry
Three staged sessions on the chemistry behind gemstones: chemical formulas and mineral classification, the trace-element chemistry that causes gem colour, and the chemistry behind treatments, simulants, and diamond type — grounded in peer-reviewed mineralogical and gemmological literature.
0 / 3 stages passed
Lab Cases
Scenario-driven identification exercises: work a case the way you would in the lab — choose the next test, interpret readings, narrow candidates, and reach a final identification. Scored by decision quality, not just the final answer.
The Dealer's Ruby
A 2.10ct oval mixed-cut transparent red stone, eye-clean at 10x with faint silky reflections visible from certain angles when tilted under a fibre-optic light.
The Filled Emerald
A medium-toned green, transparent, oval mixed-cut stone of moderate size, previously identified as natural emerald. Under the naked eye it shows a visible internal "garden" (jardin) typical of the species, with several surface-reaching fissures across the pavilion. No instrument readings taken yet in today's session.
Garnet or Glass?
A deep red, transparent, round brilliant-cut stone of about 3ct. Eye-clean at arm's length, no visible colour zoning, no obvious surface wear. No instrument readings taken yet.