DiamondsOnWeb

The ancient Romans had a ring known as a betrothal or truth ring that they wore after they were married. They were also the first to wear their wedding rings on the fourth finger of the left hand, which is the most common place for people to wear their engagement rings. Although the people of some countries do wear their rings on the right hand, the left is definitely more common. Many speculate that the tradition of wearing a ring to indicate engagement or marriage began because the vein in the fourth finger of the left hand was thought to run straight to the heart.
For the most part, in America and Canada, it is common for the man to give the woman a diamond engagement ring while he wears no ring until marriage. However, in Brazil, Egypt and many other countries, both females and males wear an engagement ring although they are usually simply matching bands of gold or silver and do not contain diamonds. Historically, in most countries, the future groom will select the ring in private and then present It to the woman as a surprise. However, recently it has been common for many couples to shop for diamond engagement rings together.

In the honor for the memory of Princess Diana death scheduled to the 31st of august we decided to mention part of her great diamond jewelry collection.
We will always carry Princess Diana in our memory.
We will remember her willingness of turning the world to a better place with the noble qualities of modesty and charisma.

These are the diamond earrings that Princess Diana wore
On here wedding day to Prince Charles, they belonged
To her mother in order to have something borrowed to her
Wedding.

source: http://www.princessdianaremembered.com/dianas_jewels_04.html