which one best? if choose No.3, which size better?thx (图)

1.Metal: Sterling silver
Clasp: Spring ring clasp
Chain: Cable chain
Chain length: 17 inches
Length: 3/4 inch
Width: 3/4 inch
Rhodium: Yes

2.Metal: 18k yellow gold and sterling silver
Clasp: Lobster claw clasp
Chain: Cable chain
Chain length: 16.5 inches
Length: 3/4 inch
Height: 3/8 inch
Width: 3/4 inch
Approximate weight: 13 grams
Rhodium: Yes

3. two different size:

tal: Sterling silver
Clasp: Lobster claw clasp
Chain: Cable chain
Chain length: 18 inches
Length: 13/16 inch
Width: 13/16 inch
Approximate weight: 6.9 grams

Metal: Sterling silver
Clasp: Lobster claw clasp
Chain: Cable chain
Chain length: 24 inches
Length: 1 1/16 inches
Width: 1 inch
Approximate weight: 14.3 grams