Necklaces

Length (in)	Length (cm)
16	40.5
18	45.75
20	50.75
24	61.0
30	76.25
36	91.50

Bracelets

Size	Wrist Measurements
X-Small	4.76-5.25 in. // 121-133 mm
Small	5.26-5.75 in. // 134-146 mm
Medium	5.76-6.25 in. // 146-159 mm
Large	6.26-6.75 in. // 159-171 mm
X-Large	6.76-7.25 in. // 172-184 mm

Rings

US Size	Inside circumference (mm)
2	41.7
3	42.9
3.5	45.5
4	46.8
4.5	48.0
5	49.3
5.5	50.6
6	51.9
6.5	53.1
7	54.4
7.5	55.7
8	57.0
8.5	58.3
9	59.5
9.5	60.8
10	62.1
10.5	63.4
11	64.6
11.5	65.9
12	67.2
12.5	68.5
13	69.7