Bail design matters because it is the pendant's attachment architecture. In a single bail pendant, the junction between object and wearer reveals how completely the maker considered the piece.
Style Notes
A layering-width bail opening is physically distinct from a standard one. It's wide enough that two chains can pass through with clearance rather than friction, and the interior dimension should be sufficient to allow both chains to move independently rather than straining against each other and the fitting walls when the necklaces are adjusted or moved.
Stone Story
Quartz registers 7 on the Mohs scale: hard enough for rings, pendants, earrings, and bracelets in regular daily wear, no protective-setting required. Durability is simply not the complication with these stones.