I had never seen the yellow enamel Niello jewelry and find the color very lovely. This is a different shape – a stylized diamond shape with wonderful open filigree work on the sides. The yellow guilloche enamel has a dragon boat design in the center. The brooch measures 1-3/4 inches by 1-1/4 inches. The back is signed Siam 925 Sterling. The brooch is in excellent condition, with no visible sign of wear.