DETAILS:
Metal Type: Solid Gold
Metal Color: Yellow
Gold Karat: 14k (stamped) 
Dimensions: 
Thickness - 1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 7.0 mm
Length - 16, 18, 20, 22, 24, 26 inches 
Closure Type: Depends on the thickness - thin chains -lobster claw
thick chains - box lock. 
WEIGHT (APPROXIMATE):
1.5mm
16" 3.9g
18"4.4g
20"4.9g
22"5.4g 
2.0mm
16"5.4g 
18"5.8g
20"6.8g
22"7.5g
24"7.7g
2.5mm
16"7.4g
18"8.3g
20"9.3g
22"10.1g
24"11.1g
3.0mm
16"12.8g
18"14.4g
20"16.0g
22"17.6g
24"19.2g
26"20.8g
8" 6.4g
4.0mm
18"22.8g
20"25.3g
22"27.8g
24"30.3g
26"32.8g
8"10.1g
5.0mm
20"40.3g
22"44.3g
24"46.58g
26"50.32g
8" 16.2g
6.0mm
16” 46 g
18” 51.75g        
20"57.5g
22"63.3g
24"69.0g
26"74.8g
8" 23.0g
 8.5" 24.4g
7.0mm
 20"74.6g
22"82.1g
24"89.6g
 8" 29.8g
 8.5" 31.7g