This is a bean necklace from Tiffany & Co. SA rank: It is a beautiful item that has been polished.
Brand name: Tiffany & Co.
Model name: Bean
Size
Chain length (including top): 75.5 cm (29.72 in) Pendant:
Height: 1.5 cm (0.59 in) x Width: 2.7 cm (1.06 in): 12.3 g
Accessories: None
Material: 750 cm (295.28 in)

Condition Guide:
S: Like new by the store's standards
SA: Almost unused, overall pristine
A: Excellent condition
AB: Great condition, minor signs of use
B: Good condition, signs of wear from normal use
C: Noticeable scratches, dirt, or signs of use
D: Heavily damaged or in need of repair
Item with difficulty being called C: