When I just graduated years ago, there is a saying in Singapore that a woman would look for 5Cs in a man before she'd agree to his proposal of marriage.
Carat (weight) : 1 carat = 1/5 gram = 200 mg = 100 points (1 oz = 132 carats)
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Diamond has remarkable optical characteristics. Because of its extremely rigid lattice, it can be contaminated by very few types of impurities, such as boron and nitrogen. Combined with the wide transparency, this results in clear, colorless appearance of most natural diamonds. Small amounts of defects or impurities (about one per million of lattice atoms) color diamond blue (boron), yellow (nitrogen), brown (lattice defects), green, purple, pink, orange or red. Diamond also has relatively high optical dispersion, that is ability to disperse light of different colors, ...