One or several stoned ring. A 1.5 carat solitaire diamond is more expensive than another one that has 6 stones at 0.25 carat each. This is due to the fact that larger diamonds are much harder to find.

Then comes the shape of the diamonds. As the diamonds come in various shapes they priced in accordance of their shape. They come in square, oval or peared shapes.

Diamonds also come in varying colors, and also a colorless diamond is much and much more expensive than those in slight colorations.