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: 2026-08-31 · 5 entries checked · 13 flagged · 33 issues confirmed · 4 corrected · 29 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
Peridot — [contradicted] Peridot is one of only two gems, along with diamonds, observed to form in the molten rock of the upper mantle, not in Earth's crust. :: The source states: 'Along with diamonds, peridot is one of only two gems observed to be formed not in Earth's
Emerald — [staleness sweep] contains time-sensitive marker (as of 2023) - verify against current source and re-date or remove
Topaz — [contradicted] Topaz is a gemstone of the second rank, or semiprecious stones :: The source states 'Topaz is a part of the second rank of gemstones, or semiprecious stones', but this is not contradicted by the source; the source explicitly states this. No cont
Aquamarine — [contradicted] Aquamarine is a pale-blue to light-green variety of the beryl family, known for its hexagonal crystal system and transparency :: The source article states 'Aquamarine (gemstone), a type of pale-blue to light-green beryl' — the page content adds
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