Red Garnet 6mm Round AA Grade Beads - 15-16 Inch R0470 Tourmaline is unusual in that

Tourmaline is unusual in that it is both pyroelectric and piezoelectric

Turquoise beads found in Iraq date back to 5000 BCE

but it is opaque as well

Yellow Opal is transparent to opaque

Moss Agate is a variety of Chalcedony

Red Garnet 6mm Round AA Grade Beads - 15-16 Inch R0470 Tourmaline is unusual in thatRed Garnet is the most commonly known type of Garnet, which occurs in many colors. Garnet has been used for adornment and spirituality by myriad cultures and civilizations throughout history, its oldest known use being in Egypt more than five thousand years ago. Garnet is used today not only as an ornamental gem, but also for industrial purposes from watch gears and scientific instruments to sandpaper and other abrasives.