Sapphire can be found in a rainbow of colors, all but red. Sapphires render black magic harmless, and help the wearer discern falsehoods. Opals are usually opaque white stones with rainbow color specks or flashes that play over the surface. Opals are thought to possess the virtues of all the stones whose colors appear there. The Roman senator Nonius chose exile rather than surrendering an Opal to Mark Antony.
Tourmalines are also plentiful, and medium priced.
Sometimes Citrine is sold as a November birthstone substitute. A nice Topaz will be clear of inclusions, and have a bright color. Rubbing or gentle heating of Topaz electrifies it, causing it to attract small particles like bits of paper or hair. Topaz in its blue form has become very popular lately, and is readily found. You may have to look for the golden shades.