A Rare Pair of Chinese Imperial Spinach Jade Seals 18TH CENTURY, LIKELY QIANLONG PERIOD the jade of remarkably vivid tone with translucent areas and a few darker streaks, each square seal surmounted by five entwined chilong, the largest on top with smaller ones to all four sides, the underside flat. Width 1 3/4 x depth 1 3/4 inches, 4.5 x 4.5 centimeters.