August Birthstones 
Modern Birthstone - Peridot 
Traditional Birthstone - Sardonyx 
Mystical Birthstone - Diamond 
Ayurvedic Birthstone - Sapphire 
Other Birthstone - Jade (from Elsewhere On Net) 

August Star Sign Stones 
Leo (Jul. 23-Aug. 22) 
Birthstone: Tourmaline, Sardonyx, Onyx 
Planetary Stone: Rock Crystal 
Lucky Charms: Peridot, Onyx, Amber 

Flower: Poppy or Gladiolus

Meaning: Conjugal felicity, Fame, dignity, protection.