Yellow gold brings out the bronze and golden colors inside a smoky quartz pendant. White gold will highlight the brown and grey tones of the gem. Either way, you can't go wrong. Ruby is known as the gem of courage. Wearing a ruby pendant can help you get through the trials and tribulations of life. An amethyst pendant is said to bring spirituality, tranquility and peace to the wearer. It is even said to help one succeed in business.