The color of a 4 carat red coral is the most sought-after feature. The most expensive colors are deep, rich reds with an almost scorching intensity. Corals with pinkish or orange tones are not as valuable. A glossy sheen and translucency add even more value to the stone. A 4 carat red stone is perfect for a pendant or ring where the beauty of the coral can be seen since it provides for an excellent display of color.