This is Tiffany & Co's Diamond By The Yard.It is a beautiful item with SA rank: Polished.
Brand name: Tiffany & Coiffany & Co.. & Co.
Model name: By The Yard
Size
Chain length: 42 cm (16.54 in) Pendant: Height: 0.5 cm (0.20 in) Width: 0.5 cm (0.20 in): 1.9 g
Accessories
None
Material
750

N: S: Unused items, exhibited items, and items that we judge to be similar.
SA: Clean item with almost no signs of use.
A: Item in good condition with little signs of use.
AB: Item with some signs of use, dirt, and scratches
B: Item with scratches, dirt, or signs of use
BC: Item with noticeable signs of use, dirt, or scratches
Item with difficulty being called C: