What does calcedony mean?
Calcedony is a chiefly historical variant spelling of chalcedony, a semi-precious gemstone belonging to the quartz family. In its familiar sense, the stone is a microcrystalline form of silica prized since antiquity for its smooth, waxy luster and its range of soft colors — milky white, gray, blue, and warm honey tones — often appearing in banded forms such as agate and onyx. Carvers have long favored it for seals, cameos, beads, and intaglios because it polishes beautifully and takes fine detail. The variant spelling 'calcedony' surfaces mainly in older books, manuscripts, and trade catalogs from periods before English orthography settled down, so encountering it today usually signals a historical source rather than a different stone. For readers and collectors, recognizing 'calcedony' as simply an earlier way of writing 'chalcedony' prevents needless confusion, while the word itself offers a small window into how spellings drifted and stabilized over centuries of English usage.
nounA chiefly historical variant spelling of chalcedony, a translucent to opaque microcrystalline form of quartz occurring in many colors and often banded or waxy in luster.
- The mineral quartz variety known in modern spelling as chalcedony, especially when referred to in historical sources using the older spelling 'calcedony'.
"The antique ring was set with a milky calcedony that glowed softly in the lamplight."
"The seal carved from pale calcedony bore the merchant's initials in fine relief."
"Early mineralogical catalogs listed agate, onyx, and calcedony among the ornamental stones of antiquity."
Rarely needed; the plural follows the standard -ies pattern only if the singular ends in -y without a preceding vowel, but historical usage typically treated specimens individually rather than pluralizing the term.
"The collection included several finely banded calcedonies alongside carnelians."
Before dictionaries standardized spelling, this gemstone's name wandered through English as 'calcedony' before settling on today's 'chalcedony'.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of calcedony
The word descends from Latin 'calcedonius' (the source also of the modern spelling via 'chalcedonius'), which Latin writers used for a valued ornamental stone. Its ultimate origin is obscure; one traditional account links the name to the ancient city of Chalcedon in Asia Minor, though scholars do not regard this derivation as firmly established. The term entered English in the medieval period, appearing in varied spellings including 'calcedony' before 'chalcedony' became standard.
How calcedony is actually used
This spelling is largely obsolete in contemporary English; modern gemological and general writing uses 'chalcedony' exclusively.
Easily confused with calcedony
Chalcedony is the standard modern spelling of the mineral, while calcedony is an older variant spelling occasionally met in historical texts.