Demantoid
Demantoid is the green variety of andradite garnet, so demantoids are always primarily green (by definition), but the exact shade ranges from a very strong yellowish green to nearly the color of a fine emerald. Some stones have a brownish cast, which is due to iron.
Demantoid garnets are associated with the heart chakra and are believed to strengthen relationships. They are also thought to help with liver problems, arthritis and varicose veins, boost vitality, and alleviate fear, insecurity and feelings of loneliness.
Demantoid was a popular gemstone during the Belle Époque period (1890-1915), especially in Art Nouveau jewelry. The Russian Czars particularly favored this gem.
The most important lucky stone for the Capricorn natives is Garnet also known as Raktamani in Hindi. This stone has several innate properties that can influence the Capricorn natives in a profound way.