RAISING : The technique of forming a flat sheet of metal over a cast iron T-stake or head, forming and compressing the metal to take a hollow form. This labor-intensive process is the purest form of silversmithing.

REFRACTION : Bending of light as it passes from air into a different medium.

REGALIA : Jewels and objects worn or held by reigning monarchs as a symbol of their sovereignty.

REPOUSSE : A process used to roughly emboss a metal object from the back or inside with larger punches than those used in chasing.

RHOMB : Shape rather like a skewed cube.

RING : A circular piece of metal worn on the finger, arm, or neck. 

RING SIZE CLIP : A spring-hardened metal strips with paired end flanges, shank to reduce ring size and make a tighter fit.

RIVETS : Rivets are a metallic rod or wire used to unite two or more metal parts.

RIVIERE : A long necklace made of a series of set stones, usually diamonds.

ROLLING MILL : A cast iron mill with polished or patterned hardened steel rollers that reduce the thickness or impart a texture on metal sheet or wire.

ROSARY : A necklace worn around the neck or a string of beads etc. held in the hands, used for counting prayers.

ROSETTE : A round ornament resembling the form of a stylized rose.

ROUGH : Term used to describe a rock or crystal still in its natural state, before faceting or polishing.