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In addition to coral substitutes, which include plastic, glass, and seashell, genuine coral is often dyed to resemble a more rare or desired variety. However, natural coral that is suitable for jewelry is found in many colors:
Pink Coral Corrallium secundum  
Pink coral is very dense and relatively hard. Its color runs the entire spectrum of pinks, from almost white to pink to nearly red. Natural marbling and color gradations in larger pink corals are natural qualities of the gem. All shades of pink coral are highly prized. Pink coral is sometimes called angel skin coral.  handmade jewelry
Golden Coral
Golden coral is found off of Hawaii. It has a resinous or laquered appearance.

Black Coral Antipathes grandis  

Black coral is rare. When it has been polished it shines with an incredible luster. Some black coral may be coral in an early stage of decay, since it is found just below the water's surface. However, Hawaiian black coral is found at depths exceeding 200 feet! A colony of Hawaiian black coral requires 50 years to mature.
Blue Coral Allopora subviolacea, Allopora akori 
Blue coral is found near the water's surface and is believed to be coral in an early state of decay.

Red Coral Corallium japonicum, Corallium rubrum, Corallium nobile
Red coral is highly valued for its hardness, beauty, and color. Red coral is found in several places, including the sandy bottom of the Mediterranean, around the Hawaiian Islands, and off the coast of Africa. Hawaiian red coral is found at ocean depths of 500-1,000 feet. Red coral only grows about 1/4 inch per year!  wholesale jewelry