The gem in a citrine pendant is considered a harmonious, optimistic, and cheerful stone with the ability to brighten up our hearts darkest places The gem in a citrine pendant is considered a harmonious, optimistic, and cheerful stone with the ability to brighten up our hearts darkest places Blue Topaz is known as the gem that has the power to improve one’s communication skills. A blue topaz pendant may make you a more eloquent and confident speaker.