MADE IN MA
This artisan gun metal wire-wrapped 10mm round cultured sea glass beads, each has been done in a Herringbone wire-wrapped design, connected together with square detailed antique silver pewter flat metal beads & finished off with a gun metal clasp. Measures ~8-3/8" from end-to-end. This picture is enlarged to show detail.
Cultured sea (some call beach glass) has been physically & chemically weathered which produces natural frosted glass giving these the same effect as pieces of sea glass you find along the ocean shores - but you get a bigger color range with the cultured sea glass.
There are plenty of free online measurement converters should you want different measurements.