You should consider the following factors when you purchase a diamonds for your jewelry:

1) Cut: The diamond's proportions must reflect as mush light as possible. The most important factor of the cut is the proportions because the diamond can has the most beautiful shape but if it doesn't reflect light it will look like a peace of glass. Traditional shapes are round, heart, pear, oval, marquise, princess, baguette and emerald.

2) Carat: Carat is the weight of the diamond. 0.2 grams equals 1 carat. Parts of a full carat are measured in points where 1 carat equals 100 points. Thus a diamond of 25 points is a quarter of a carat.

3) Colour: Determining the colour of a diamond you have to look at the inside of the diamond. The colour less (White) diamonds is the rarest and therefore the most expensive. The whitest diamond is categorised as a D. The more colour (yellow to brown) the diamond has the lower in the alphabet it will be categorised.

4) Clarity: The diamond with the least flaws on the surface is the clearest diamond. The flaws are usually microscopic therefore you must get a external certificate indicating any flaws.

Taking these factors into account will go a long way to ensure that you have quality wedding jewelry.