When looking at the diamond, you need to know 4 things;
Which Cut – this is the aesthetic part of the process. A really quick summary is that it is not only about the shape of your diamond – from round to princess, heart to emerald, but also about the brilliance that emits from it. How it reflects the light is often more important than the actual shape.
The Clarity – Basically defines how flawless your diamond is. It runs in a scale from F – for flawless, S for slightly included but unable to be seen with the naked eye, to I – for included. Most people would be very happy with a solitaire that had a clarity scale of VSI2 (very slightly included) or higher.
The Color – The less color in your diamond the better. A diamond’s color scale runs from D – J; D-F being classed as colorless, G-J having trace amounts of color when placed upside down on white paper. To be honest, by the time you have mounted your diamond in its setting most people will not be able to see any color at all.
As stated here, the best color for a diamond if you are looking for good value is G or H. These diamonds tend to face up white and are cheaper options than getting a D color diamond.
How Many Carats? – This is directly proportional to the size of the stone. A carat is .20 grams. (pssst, The greater the carat the more expensive it is).
The only other thing that you need to consider when you design your own engagement ring is the ring size. If you don’t know your beloved’s ring size and your proposal will be a surprise then grab a ring that she already has and use a ring sizer chart to get the right sizing.
Your moment is unique.
Your ring should be too.