Title: Nécessaire
Object type: Nécessaire
Date: ca. 1770–72
Artist: Watchmaker: James Cox 
Artist bio: British, ca. 1723–1800
Artist nationality: British
Artist role: Maker
Medium: Case: moss agate, mounted in gold and set with diamonds, rubies, and emeralds; silver; Dial: white enamel, with frame pavé-set with paste jewels
Dimensions: Overall (confirmed): 3 3/8 × 3 9/16 × 2 1/8 in. (8.6 × 9 × 5.4 cm);
Overall (.128b–e): 1 1/16 x 1 x 13/16 in. (2.7 x 2.5 x 2.1 cm);
Overall (.128f): 15/16 x 7/8 x 13/16 in. (2.4 x 2.2 x 2.1 cm);
Overall (.128g, h): 3/4 x 1 3/8 x 15/16 in. (1.9 x 3.5 x 2.4 cm);
Overall (.128i): 1 1/8 x 2 7/8 x 7/8 in. (2.9 x 7.3 x 2.2 cm);
Overall (.128j–m, each): 2 13/16 in. (7.1 cm);
Overall (.128n): 2 3/8 in. (6 cm);
Overall (.128o): 1 5/16 in. (3.3 cm)
Classification: Metalwork-Gold and Platinum
Credit line: Gift of Florence Harris Van der Kemp, 1957
Department: European Sculpture and Decorative Arts
Repository: Metropolitan Museum of Art, New York, NY