The term 'emerald and ruby' refers to two precious gemstones that are both highly valued for their beauty and rarity. Emerald is a deep green gemstone, while ruby is a deep red gemstone. Both gems are often used in jewelry and other decorative items. The crossword solution for the term 'emerald and ruby' is 'HUES, ' which refers to the colors of the two gemstones. Emerald is a deep green hue, while ruby is a deep red hue.