Rauchquarz - smoky quartz
raumgreifend - space-encompassing
Rauschgold - tinsel, gold foil
Reibung - friction
Reichtum - riches, wealth
Rekristallisation - recrystallization
Rekristallisationstemperatur - recrystallization temperature
Rhodinierung - rhodium-plating
Rhodium - rhodium
Rhodolith - rhodolite
Riechkapsel - pomander
Riffelfeile - riffler file, engraver's riffler file, die-sinker's riffler file
Ring - ring
Ringmaß - ring gauge, finger-ring gauge
Ringmaß-Set - set of ring stick and ring gauge
Ringschienenbiegezange - ring bending plier
Ringstock - ring stick, ring mandrel
Röhrchen - tubule
Röhre - tube
Roségold - rosé gold
Rosenquarz - rose quartz
Rosolit - rosolite
Rotgold - red gold
Rubellit - rubellite
Rubin - ruby
rund - round; rounded (abgerundet)
Runddraht - round wire
Rundfeile - round file
Rundfibel - circular fibula, brooch
Rundiste - girdle
Ruthenium - ruthenium