MOP - Nacre, known as mother of pearl, is a natural iridescent substance formed in the inner layer of the shells of some mollusks, especially oysters and abalones. Often, it is dyed. MOP has a beautiful shimmer that is difficult to capture in a picture.
Laminate - A layer of material united by an adhesive or other means
Druzy - A coating of fine glittery crystals which can appear on a rock fracture surface, vein or within a vugg or geode.
Dichroic Glass - A glass which displays two different colors by undergoing a color change in certain lighting conditions.