We publish our audit record because accuracy claims should be checkable. Every entry on this site runs through an automated fact-audit pipeline (accuracy audit → source-grounded repair → visual QA); this page is generated from that pipeline's own report, not written by hand.
Last full accuracy audit: 2026-09-09 · 22 entries checked · 17 flagged · 34 issues confirmed · 0 corrected · 34 still open
Ruby — The traditional cardinal gems are ruby, sapphire, emerald, and diamond; amethyst is not included in the classic list.
Ruby — Moissanite has a Mohs hardness of 9.25, and diamond is 10, so ruby is not second only to moissanite and diamond; the phrasing is misleading.
Sapphire — The entry claims sapphire is the third-hardest mineral after diamond and moissanite, but moissanite is not a naturally occurring mineral in common gemological contexts and is not on the standard Mohs scale of natural minerals, making the ranking misleading.
Opal — The claim that 'the only known source was beyond the Roman frontier in Slovakia' is historically inaccurate; the Dubník area was within the Roman Empire at times, and opals were also mined in other locations such as India.
Amethyst — The LORE section states 'The goddess Diana transformed her into a white stone, and Bacchus poured wine over it, dyeing the crystals purple.' This is a misattribution of the myth; the story involves the nymph Amethyst, not Diana transforming 'her' (the nymph) i
Amethyst — The LORE section states 'This myth and its variations are not found in classical sources.' This is factually incorrect; the myth of Amethyst (the nymph) is indeed found in classical sources, most notably in the poem by the Greek poet Nonnus in his 'Dionysiaca'
Topaz — The chemical formula in the INTRO is given as AlSiO(F, OH), but the correct formula for topaz is Al2SiO4(F, OH)2.
Topaz — The LORE section says 'The name topaz was first applied to the mineral now known by that name in 1737.' This is incorrect; the name was used long before that date.
Garnet — The entry states that garnets 'never form true cubes,' but garnets can form cubic crystals (e.g., andradite and grossular sometimes exhibit cubic habits), so this claim is incorrect.
Peridot — Peridot is not one of only two gems formed in the upper mantle; other gems such as diamond and some garnets also form in the mantle.
Peridot — Pallasitic (extraterrestrial) peridot does not lack nickel; in fact, pallasitic olivine often contains nickel.
Tourmaline — The name is derived from the Sinhalese tōramalli, which refers to carnelian gemstones. Correction: The Sinhalese word 'tōramalli' actually referred to a group of mixed-colored gemstones, not specifically carnelian.
Tourmaline — Tourmaline was sometimes called the 'Ceylonese Magnet' because it could attract and then repel hot ashes due to its pyroelectric properties. Correction: The pyroelectric property allows it to attract when heated, but it does not actively repel; it loses attrac
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