Natural Green Vessonite Garnet Smooth Polished Roundel Beads Strand Length is 14 Inches and Size is 3mm approx..Good Quality Vessonite ~ Small Beautiful Size Garnets /???rn?t/ are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. Garnets /???rn?t/ are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite or cinnamon-stone and tsavorite), uvarovite and andradite.