37cm strand (approximately 46 beads) of clear quartz rectangular beads, each bead varies in size, but is on average approximately 8mm x 4mm x 4mm. Quartz comes in many shades, these beads are quite clear. Amongst it's other qualities, quartz is said to be the universal healing stone. With a hardness of 7, quartz is one of the most abundant minerals on earth. It comes in a variety of colours and in two main groups: crystalline and cryptocrystalline. Please note that colours and sizes within semi-precious gemstones vary slightly from strand to strand.