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: 2026-08-26 · 5 entries checked · 4 flagged · 8 issues confirmed · 4 corrected · 4 still open
Ruby — The Montepuez ruby mine was not discovered in 2009; the deposit was known earlier and commercial mining began around 2012.
Sapphire — The claim that moissanite does not rank above corundum in hardness is factually incorrect; natural moissanite has a Mohs hardness of 9.5, harder than corundum's 9.
Sapphire — The 'DID YOU KNOW' section refers to a 510 kg cluster as a 'star sapphire cluster' without clarifying that it is a rough corundum mass, not a cabochon-cut gem exhibiting asterism, which is misleading.
Emerald — The entry states 'primary hue necessarily dark green' but the primary hue of emerald is green, not necessarily dark green; the correct description is medium to dark tone.
Emerald — The claim that Colombia accounted for 47% of global output in the decade leading up to 2005 is not a widely cited standard statistic and may be inaccurate or unverifiable.
Opal — The entry lists 'diatomaceous earth' as a variety of common opal, but diatomaceous earth is a distinct sedimentary rock, not a variety of opal.
Opal — The entry claims J. V. Sanders showed in the mid-1960s that ordered spheres produce colors by interference and diffraction described by Bragg's law, but the complete explanation using Bragg's law was more fully established by later researchers (e.g., Darragh,
Peridot — [hero audit] hero image does not depict the subject: MISMATCH The image shows a desert landscape with cacti and distant mountains, which has no connection to "Peridot" — a type of green gemstone. The su
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