Aquamarine is always a shade of pastel blue, but darker, more saturated tones almost always cost more. Connoisseurs also prefer a pure blue, with no green in it. Stones with a tinge of green can be bought for less, and aren't necessarily less appealing to a consumer.credit: http://www.amsterdamsauer.com/gemstones/?/aquamarine.htmBecause the color is generally pale, aquamarine should have a good clarity for maximum brilliance. These stones are often cut in ovals and emerald cuts. More saturated colors are unusual in small sizes: usually it takes some size for the color to hold in a darker shade. Flattering to almost any skin tone,...