These are actually intricate hand made beads, of brass, with tiny chips of lapis lazuli and turquoise embedded in resin. The red may be coral chips but I am not sure. They are made in the Himalayas, probably in Nepal rather than Tibet. I suspect that the stone chips have been somewhat dyed to enhance their colour. They are discreetly glued on gold-plated brass or plain brass mounts.
Left: 13/16 inch (2.0 cm) wide, 3/8 inch (0.95 cm) deep and 1 7/16 inches (3.6 cm) tall.
Centre: 5/8 inch (1.6 cm) wide, approximately 1/4 inch (0.6 cm) deep and 1 inch (2.5 cm) tall.
Right: 5/8 inch (1.6 cm) wide, approximately 1/4 inch (0.6 cm) deep and 13/16 inch (2.0 cm) tall