The rotating barrel action in a revolver clasp is drawn directly from revolver firearm mechanics, a design parallel built on the same rotational locking principle.
Style Notes
For a piece intended to be worn for decades, 14kt white gold is a sound choice: it has maintained continuous prominence in fine jewelry for over a century with no indication of declining relevance, which is about as close to stylistically safe as fine jewelry gets.
Industry Insight
In a diamond, brilliance is visible as the concentration of white light returning through the table facet, and fire appears as flashes of spectral color at the stone's edges and facet junctions. Both depend on the cut, whereas facet angles, proportions, and alignment determine how effectively the stone captures incoming light and returns it as brilliance and fire through the crown.