You have diamonds that cost in the mid-range, which may contain a secondary hue or color, or diminished intensity. Pure orange, for example, come at prices quite close to those of yellow diamonds, although the presence of a second yellow or brown hue in the stone can bring down its value. This makes for a wide range of pricing, with some colored diamonds costing less than colorless diamonds, while others cost more. There are extremely expensive diamonds of colors including pure orange, pink, purple, etc., which are so rare you have to pay the proverbial arm and leg to get one. You find many of these sold at auctions, and fetching millions of dollars apiece. Any improvement can drive up the price exponentially. With a colored diamond, you get the advantage of any inclusions being better hidden. When getting a dark colored diamond you can buy cheap by compromising heavily on clarity, which is something you would not think of doing with a colorless diamond.