Before you head to jewelry shops or check online stores for ordering the perfect engagement ring, you need to know how to buy the best engagement ring to surprise your girlfriend. The average cost of an engagement ranges anywhere from $2000 to $5000. It is also a good idea to take note of her likes and dislikes.

Does she prefer a color or a particular stone? Will a diamond ring impress her? Researching a bit about different ring shapes, sizes and cuts will give you a better idea about making the right purchase. Here are 20 interesting facts about buying an engagement ring as an individual or as a couple.

Infographic by American Tungsten