Glossary

Rock (geology)

Ring finger

Ring (jewellery)

Rhombus

Rhombicosidodecahedron

Rhodolite

Repoussé and chasing

Religious vows

Relative density

Refractive index

Refraction

Reflection (physics)

Red beryl

Quartz

Prism (optics)

Pressure

Premier Mine

Pre-engagement ring

Precious metal

Precious coral

Prasiolite

Portrait miniature

Popigai impact structure

Polishing (metalworking)

Pliers