The revolver clasp is fixed, which makes sense given that it is a precision component machined to close tolerances. Fit is handled in the chain or bracelet, through extenders or multiple attachment points.
A Storied Heritage
Enamel was what made Art Nouveau jewelry's naturalistic ambition achievable. The full chromatic range of flowers, insects, and landscapes wasn't available through gemstones alone.
Stone Story
Gem-quality mined diamonds formed one to three billion years ago, with the oldest known crystals at 4.25 billion years old. That's older than the Earth's oceans and older than most of the planet's surface geology.