The birthstone for September is a combination of five different gemstones: SAPPHIRE (8 letters), OPAL (4 letters), TOPAZ (5 letters), GARNET (6 letters), and RUBY (4 letters). SAPPHIRE is a precious gemstone that is typically blue in color, while OPAL is a milky white stone with flashes of rainbow colors. TOPAZ is a yellow-orange gemstone that is often used in jewelry, and GARNET is a deep red stone that is known for its durability. Finally, RUBY is a vibrant red gemstone that is highly valued for its rarity.