The following size information comes direct from The BreastForm Store where these Divine Collection nipples are sold.

Gigi 45

Areola: 1 ¾ inches
Nipple: ½ inches across
¼ inches protrusion

Lexi 60

Areola: 2 ⅜ inches
Nipple: 5/8 inches across
3/8 inches protrusion