Goldstone 1x2mm Square Rondelle - 15-16 Inch 4x2.5mm it has often been used

it has often been used as a substitute

This material is actually Serpentine

Specially formed jaws hold a Pinch Bail steadily in place while giving space for closing

as well as a lucky stone for sailors

Goldstone 1x2mm Square Rondelle - 15-16 Inch 4x2.5mm it has often been usedGoldstone is a manmade material, consisting of opaque rust to red glass with tiny flecks of glittering copper suspended within it. Goldstone was first created during the Italian Renaissance when, as legend has it, a Venetian monk tipped molten copper into a vat of molten glass. When this combination crystallized, the result was glass permeated with thousands of tiny metallic sparkles.