Ruby and Emerald are both precious gems that have been used in jewelry for centuries. They are both known for their beautiful colors and luster. Ruby is a deep red HUE, while Emerald is a vibrant green HUE. Both gems are also known for their durability and hardness, making them ideal for use in jewelry. The term 'GEM' is a three-letter word used to describe these precious stones, while 'JEWEL' is a five-letter word used to refer to any precious stone or GEM. Finally, 'HUE' is a three-letter word used to describe the color of a GEM, such as the deep red of Ruby or the vibrant green of Emerald.