Length cm Length inches 
16 cm 6.299 in
16.50 cm 6.496 in
17 cm 6.692 in
 17.50 cm 6.889 in
18 cm 7.086 in
18.50 cm 7.283 in
Chains Necklace cm Chains & Necklace inches
40 cm Choker 15.748 in
45 cm Princess 17.716 in
55 cm Matinee 21.653 in
60 cm Opera 24 in
76-84 cm Rope or Lariat 30 - 33 in