Step cut gemstone feature trapezoid shaped or rectangular facets in concentric rows, but there are many modified variations of this faceting style available today. In fact, there are many different ways to describe gemstone shapes and cuts, and there is almost always more than one "correct" way to describe a specific
gemstone shape and cut-style.
A single gemstone may be described as being 'round-faceted', 'round brilliant-cut', 'round diamond-cut', or even just simply 'round cut'; although some of these terms are more descriptive than others, none would be considered incorrect when used to describe the said gem.
In the colored gem industry, descriptive terms are used loosely because there is no universally recognized official terminology when it comes to all of the fancy cuts and modified cuts available today. In the past, "trilliant-cut" could only be used to describe "brilliant-cut" triangular gemstones (hence the name "tri"-"lliant"), but now the term is accepted by most when used to describe any triangular gemstone including step cuts, cabochons and plain cuts.