Necklace lengths:

Standard Necklace Sizes for Men*

18"- Base of the neck (*for smaller neck sizes)
20"- to collarbone(*most common length for average men)
22"- A few inches below the collarbone
24"- Just above the sternum

*Note: Its a good idea to select the next size up for larger neck sizes.

Standard Necklace Sizes for Women*

16"- Choker Length
17-18"- at collarbone
20"- A few inches below collarbone
22"- At or above neckline
24"- Below the neckline