The purple spiney oyster shell is obtained at a deeper depth than the orange (we don't buy the red). Occasionally the membrane of the shell is yellow instead of white. It is desirable to incorporate the yellow membrane if possible. This section of the shell is a perfect example of the technique. It was smithed by Robert Shakey, Navajo. It weighs 12.5 grams (.44 ounces) and is 1.5 inches long not counting the bale. Shipped with a solid sterling silver 18-inch box chain.