Necklace Lengths: 
Not sure how long of a necklace you need or how long the necklaces are that you're shopping for? Here is a great chart to give you a good sense of length.
Necklace-Sizing

Ring Sizing:
There is no fool-proof way to measure a ring unless you have the appropriate tools - but here are two ways that we recommend to get you close. 

Note that if you are between sizes, or not sure, order a larger size (it's easier to size down, than size up)! Also remember that if your knuckle is larger than your finger's base, you will need the ring to fit over your knuckle, so take that measurement, too. 

1. The Current Ring Method: Take a current ring and measure the inside diameter.
Current Ring Method

2. The Wrap Method: Cut a string or paper strip about 100mm long and 2mm wide, wrap around the base of your finger. It has to fit snug, but not too tight. Mark the point on the string/paper where it overlaps forming a circle. Compare the length of the string/paper to the chart attached.
Wrap Method

Men's Rings - Thickness: 
Mens Rings Thickness