What is a triplet in gemstone terminology?

In gemstone terminology, a triplet refers to an assembled stone made from three separate pieces of material fused together. This construction typically involves a dominant layer, often made from a more durable material like a harder gemstone or synthetic substance, which is supported by layers beneath it. The purpose of this layering is to enhance the stone's appearance, especially in terms of color and brilliance.

The top layer is often a thin slice of a colored gemstone, which provides the visual appeal, while the other layers serve to provide stability and help protect the more delicate surface. This method allows for the creation of visually striking gemstones that can showcase beautiful colors and patterns, which would otherwise be difficult to achieve with a single natural stone.

The other choices describe different concepts in gemology or gemstone crafting but do not accurately define what a triplet is in this context.