What do we call gemstone sizes that are cut to fit standard mountings?

Gemstone sizes that are cut to fit standard mountings are referred to as calibrated sizes. This term denotes that these stones are precisely shaped and sized to fit into specific mounting settings, which ensures a uniform fit and aesthetic appeal in jewelry. Calibrated gemstones often come in standard measurements, allowing for easy compatibility with various settings and designs, making them highly desirable for jewelers and consumers who seek convenience and consistency when selecting gemstones for their pieces.

The other terms mentioned do not correctly define this concept. While standard sizes might imply a similar meaning, they do not specifically capture the aspect of being designed to fit into defined mounting sizes. Custom sizes refer to unique or bespoke cuts tailored to specific requests or designs, while free sizes indicate stones that have not been cut to meet predefined measurements and may vary in dimensions. Calibrated sizes are therefore the specific terminology that accurately describes stones created for standardized compatibility with mounting.