Question: John Loring is design director emeritus of which New York City jeweler?

Context paragraphs:
Paola De Luca: Paola De Luca (born 18 November 1966) is an Italian luxury trends forecaster, best known for developing a Trend Book predicting global jewellery design trends, and began her career as a jewellery designer.  More recently, she has worked as Design Director of Rio Tinto Diamonds since 2010.  De Luca is the founder of The Futurist Ltd, a research and creative intelligence company that carries out projects for clients in the global luxury sector.  De Luca leads design projects and educational programmes for buyers and government organisations, and gives seminars forecasting global jewellery design trends at international trade fairs.  She was a pioneer in the field of jewellery design trend forecasting reports, which she started as in-house research while working for UnoAErre, a leading Italian goldsmith and manufacturer.  De Luca studied goldsmithing, metalwork, fashion and arts design in Rome before moving to New York City in her early 20’s where she worked as a fashion and design director for UnoAErre and for brands such as Fendi.

George M. Martin: George M. Martin, M.D. (born June 30, 1927, in New York, New York) is an American biogerontologist.  He received both his B.S. in Chemistry and his M.D. from the University of Washington and has been a member of its faculty since 1957.  Dr. Martin is a Professor Emeritus (Active) in the Department of Pathology, Adjunct Professor of Genome Sciences (Retired) and Director Emeritus of the University of Washington’s Alzheimer's Disease Research Center.

The Great Diamond Robbery: A diamond potentially worth $2 million, the "Blue Goddess," must be cut.  A New York City jeweler, Bainbridge Gibbons, has an expert lined up, but his own diamond cutter, Ambrose C. Park, strongly urges Gibbons to let him do the cutting.

John Macleod (art director): John Macleod is the deputy design director of the "New York Times".  Prior to that he art directed the Business and Science sections of that paper.  Before rejoining the Times in 1997, he was a founding partner in Design 5 a New York based design studio that specialized in book design, corporate identity and packaging.  Under the tutelage of Milton Glaser he worked on the launch of "American Lawyer" and designed and art directed "Corporate Finance Magazine".

Gachalá Emerald: The Gachalá Emerald, one of the most valuable and famous emeralds in the world, was found in the year 1967, in the mine called Vega de San Juan, located in Gachala, a town in Colombia, located 142 km from Bogota.  Gachalá Chibcha means "place of Gacha."  Presently the emerald is in the United States, where it was donated to the Smithsonian Institution by the New York City jeweler, Harry Winston.

John Loring (designer): John Loring, (born November 23, 1939), is design director emeritus of Tiffany & Co., where he was design director from 1979 to 2009.  He is the author of numerous books about Tiffany's and art in general and a longtime contributor to "Architectural Digest".

Summit School (Queens): The Summit School is a state approved, private special education school in the Queens borough of New York City.  It operates on two campuses in Queens and surrounds the St. John's University campus.  The Lower School, which educates elementary and middle school students, utilizes space in the Hillcrest Jewish Center, and the Summit's Upper School serves high school students.  It is currently directed by Alexandra Tzeroya under the mentorship of Director Emeritus Judith Gordon, who co-founded and revised the school.  In contrast to most private schools, which are independently operated, Summit is tuition-free and accepts students from all five boroughs of New York City as well as from Westchester, Nassau, Suffolk, and Rockland Counties.

George Switzer (mineralogist): George Shirley Switzer (June 11, 1915 – March 23, 2008) was an American mineralogist who is credited with starting the Smithsonian Institution's famed National Gem and Mineral Collection by acquiring the Hope Diamond for the museum in 1958.  Switzer made the arrangements when renowned New York City jeweler Harry Winston decided to donate the Hope Diamond to the Smithsonian.

Paul J. Smith (arts administrator): Paul J. Smith (born September 8, 1931) is an arts administrator, curator, and artist living in New York.  Director Emeritus of the Museum of Arts and Design (formerly the Museum of Contemporary Crafts, of which he served as director in 1963–1979, and, following the change of the museum's name to American Craft Museum, 1979–1987), Smith has been professionally involved with the art, craft, and design fields since the early 1950s and is closely associated with the twentieth-century "studio craft movement" in the United States.  He joined the staff of the American Craftsmen’s Council (ACC, now the American Craft Council) in 1957, and was appointed Director of the Museum of Contemporary Crafts in 1963.  In September 1987, after 30 years with ACC, he assumed the position of Director Emeritus to provide independent consulting for museums, arts organizations, and collectors.

Tiffany &amp; Co.: Tiffany & Company (known colloquially as Tiffany or Tiffany's) is an American luxury jewelry and specialty retailer, headquartered in New York City.

Supporting paragraphs: John Loring (designer) Tiffany &amp; Co.
Answer: Tiffany & Co.