Tanzanite Natural Genuine Facet Rondelle Loose Beads 4.5mm (Qty=16) 16 Loose Genuine Tanzanite Rondelle Beads 4.5mm diameter, medium size for Tanzanite about 2" = 16 beads 16 beads, = ~2" if strung, small holes use 30 gauge wire or .010" cord Tanzanite has different colors in different lights In daylight these are very nice blue, under photo lamps some have violet blue color