Radiant Cut: diamond cut.
Ransch gold: Yellow copper alloy (brass) often used to create stage gold.
Rebus: puzzle composed of images which revealed the name of the owner when solved. Also used as a term for complex monograms. Often used on signet rings.
Refractive Index: Used to describe a property of gemstones, measured by a refractometer. (The ratio of the speed of light in air to it’s speed its speed in a substance.)
Regard: Acrostic jewellery with colored stones the first letters of which spell the word “regard”, (ruby, emerald, garnet, amethyst, ruby, diamond.) Victorian era.
Regent Diamond: celebrated diamond, displayed at the Louvre.
Relief: design which sinks above or below the surface of the piece (i.e. cameo).
Repoussé: High relief design made by hammering, embossing or punching the reverse side of the metal.
Resilla: head ornament with a fishnet-like design. (c. 16th and 17th century).
Retro: a jewelry style created between approximately 1935 and 1945 (up to 1950).
Reverse crystal intaglio: rock crystal cabochon with an intaglio carved on the back instead of the top.
Rhodium: a silver-white precious metal, member of the platinum family.
Rhodochrosite: transparent to translucent mineral with rose-pink color and undulating bands of gray, brown or white.
Rhodonite: translucent to opaque pink to red gemstone with patches or veins of black throughout.
Rhinestone: Faceted rock crystal beads, originally from the Rhine River.
Rice Pearls: Chinese freshwater cultured pearls shaped and textured like rice grains.
Riker Brothers: Art Nouveau American jewellery firm notable for plique-a-jour pieces.
Rivière: Choker necklace made of a line of graduated or equal size gemstones.
Rock Crystal: transparent colorless form of quartz.
Rosary ring: (aka decade ring) ring with ten bumps around the outside of the shank for use as a prayer counter.
Rose cut: A diamond cut.
Rose gold: gold alloy with copper (results in reddish colour gold).
Rose quartz: pink coloured quartz.
Rosettes: floral designs built up out of several diamonds.
Rolled Gold: Type of gold-plating.
Roman gold: technique of matting or frosting followed by electroplating with pure gold.
Romantic Era: The Early Victorian period of 1837-1860 is also known as ‘The Romantic Period’.
Rondelle: Pierced metal or gemstone strung between beads. (also known as a ‘spacer’).
Rope length: a necklace length between 100 and 120 cm (37-60 inches).
Rubel: American jeweler (John Rubel and Co and he also worked for Van Clef & Arpels). He is famous for his 1940’s angel and dancer brooches.
Ruby: precious gemstone, red in colour.
Running dog: repetitive pattern of ‘Greek Keys’ motif.
Ruolz: can refer to certain silver plated metals or a silver alloy invented by a chemist name Ruolz.
Ruser (1947-1969): American jeweler known for 1950’s and 60’s figurative pieces featuring freshwater pearls.
Russian Gold Finish / Plating: A type of finish developed in the early 20th century that was actually a type of brass plating over a brass form. (Miriam Haskell used this finish a lot).
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