Learn › Glossary › Jewel tones Design & style Jewel tones Deep, rich, saturated colors named after gems: emerald, sapphire, ruby and amethyst. Also called jewel tone Jewel tones are saturated colors with medium to low lightness, like emerald green, sapphire blue and ruby red. They feel luxurious and look best against dark or neutral backgrounds. ← PreviousHue All terms Next →Lightness