Taken from an article at styleweddings.com

The diamond, a symbol of eternity, has been used on wedding bands since the 1300s. Its colour and clarity remain constant and last forever, representing an eternal commitment to each other.

Always remember the 4Cs when choosing a diamond - Colour, Clarity, Cut and Carat. The best rule of thumb is to always find an optimum combination for your budget. Always get a diamond that is certified by worldwide-recognised authority such as GIA, HRD or AGS.

When getting a solitaire as an engagement ring, choose one that is as colourless as possible, and thus able to have more scintillation and brilliance. In other words, it will give off a blinding shine.

The more common diamond shapes for engagement rings are the round brilliant and the princess cut. A thinner shank (band) accentuates the diamond more, and the classic setting for the diamond is a 6-prong.

As an engagement ring carries a huge and priceless sentimental significance, you should never scrimp when buying a ring for your loved one. But don't go broke in the process. According to Sandra, a rough gauge is about two to three times your monthly salary. However, what matters most in the end is the quality of the diamond and the design of the ring."

I found it! It was practically love at first sight! I hope my fickleness will not interfere again. *skips to jewellery store*