Marquise Cut Diamond
Longer, and pointy at its two ends this stretched out brilliant cut diamond looks very good if you want something really different and something that can run down the length of the finger. The name "Marquise" comes from the legend of the Marquise of Pompadour that the Sun King wanted a Diamond to be polished into the shape of the mouth of the Marquise!
A Marquise shaped diamond looks like this:

Tataza Diamonds has a great selection of Marquise shaped diamonds