This is such a rich looking necklace, sterling silver gold vermeil, 15-17 inches in length. This is also available in 10 k gold.
The third picture has a curb chain, 14.5-17 inches long, sterling silver vermeil.
The last picture, the shorter necklace is the figaro chain, the longer necklace can be purchased under liquid gold necklace 18 inch (not over here).