1. Different shaped/cut diamonds
Emerald cut:
The Tiffany Heart Bezet:
2. Coloured diamonds
Black diamond, like the one Carrie Bradshaw (from Sex and the City) received from Mr. Big:
Yellow diamond:
3. Other precious gems
Sapphire rings made popular by Kate Middleton's engagement to Prince William:
Jessica Simpson's ruby engagement ring:
4. Custom-designed rings - Some people prefer a ring that is unique and personalized, and enjoy the designing process where they can choose the specific cut, colour, clarity, size, and style of the ring. A friend of mine even specified to his jeweller that he wanted heart-shaped prongs for his girlfriend's ring:
5. Man-made/Cultured diamond rings - Some brides would like the assurance that their ring is completely conflict-free by being made in a labratory. These stones differ from cubic zirconia (CZ), as CZ is made with zirconium dioxide and is not as hard as a man-made diamond. Man-made diamonds normally costs 35% less, but share an identical internal crystalline structure as diamonds found in nature.