The practice of giving a ring upon betrothal dates back to ancient times. However, it was a far cry from what is sold today, normally consisting of a plain metal band. The first known instance of a diamond ring given to an intended bride was quite literally fit for a queen. It was given in 1477 by the Emperor Maximilian to Mary of Burgundy to celebrate their engagement. About two hundred years ago, the supply of diamonds became more plentiful and the Industrial Revolution brought more wealth to the average person. The combination of factors allowed more people to buy diamonds, once within the reach of only the wealthiest.

Solitaire engagement rings are the most popular variety sold. The term technically refers to a ring with a single stone, regardless of cut. However, a round cut is the most common, although there are many different ways to mount it. The round cut is considered to be optimal for enhancing the reflective properties of a diamond.

A trilogy ring is a variation on a solitaire. This style has two small stones with a larger one between them. These are typically all three diamonds, but variations have become very popular in recent decades. Sometimes, a sapphire, emerald, or ruby is substituted for the center diamond, while at other times the bride may choose her birthstone.

Some brides prefer an antique engagement ring. Most of these date from the turn of the nineteenth century through the 1950s, since any older than 50 years can be called an antique. The majority of these are diamonds. There are also many from the 1920s and 1930s made in the art deco manner that often use other gems as well. Rings that date back further than that may not use diamonds, especially those older than about 1700. Many of these are set with other precious gems, and may feature very intricate designs.

Princess cut engagement rings have become very popular in recent years. A princess cut is flat on the top and square in shape. The stone may be set so that it is flush with the band, but the usual mount has prongs that cover the corners of the stone.

Rectangular stones are often referred to as emerald cuts. They are usually faceted on the sides and feature a flat top. A marquis cut refers to a stone that is basically round, but tapering to a point at both ends. Pear shapes are more commonly used in earrings, pendants, or with other stones due to their clunky shape. A pear shaped diamond is round at one end and pointed at the other.

Many modern beliefs about diamonds are not historic traditions, but instilled by advertising campaigns launched by the major jewelers. For instance, the suggestion that a groom spend at least two times his monthly salary on an engagement ring came from such a campaign. However, diamonds have only continued to grow in popularity among prospective brides. Thankfully, diamonds are now more plentiful, affordable, and varied, which lets almost every bride add a sparkler to her hand.