Yellow silk knotted green Agatha bead necklace with a 22k gold leaf Vietnamese coin (Nguyễn Dynasty 1802–1945). 24 inches – 60cm Retail Value: $325 In Vietnam, the color yellow is the most prized color derived from the five elements. The emperor was believed to be at the center of the five types of chi, that dominates different periods in our existence. Therefore, yellow was known to be the imperial color. Wrap this necklace around your neck, and feel centered and in harmony with your Chi.