Conch shells are the spiral shells of mollusks, which are sea snails found in the ocean and which you may buy on eBay. The conch's shell will thicken as it grows older. When the conch is mature, it can be harvested every five years or so, depending on its size. The meat inside the shell is white and tender and has a flavor similar to lobster. There are several varieties of conch available. Dorsum conchs have smooth shells that are dark blueish-black with a yellow tint. They usually weigh between 1 and 4 pounds (0.5 and 1.8 kg) and can be eaten raw or cooked. Sunconchs have brownish-yellow shells with black markings. They usually weigh between 5 and 10 pounds (2.3 and 4.5 kg) and can only be eaten cooked. Tritons have orange or red shells with white spots. They usually weigh between 15 and 30 pounds (6.8 and 13.2 kg) and can only be eaten cooked. True conchs have greenish-white shells with black stripes. They usually weigh between 35 and 100 pounds (15.5 and 45.5 kg) and can only be eaten cooked. Conch was once valuable for its shell. Today it is used primarily for food.