Question: The distinctive interior of The Church of the Covenant is largely the work of an American luxury jewelry and specialty retailer headquartered where?

Context articles: YVEL
Tiffany &amp; Co.
Marcus &amp; Co.
Church of the Covenant (Boston)
Covenant Health System
Alor (company)
Kristall Smolensk
Kuhn &amp; Komor
Blue Nile (company)
Eclarity

YVEL (pronounced E-vel) is a privately held luxury jewelry company in Jerusalem.
 Founded and owned by Orna and Isaac Levy, the company is best known for its pearl jewelry.
Tiffany & Company (known colloquially as Tiffany or Tiffany's) is an American luxury jewelry and specialty retailer, headquartered in New York City.
Marcus & Co. was an American luxury jewelry retailer from 1892 to 1962 in New York City.
The Church of the Covenant is a historic church at 67 Newbury Street in the Back Bay neighborhood of Boston, Massachusetts.
 A National Historic Landmark, it was built in 1865-1867 by the Central Congregational Church, and is now affiliated with the Presbyterian Church (USA) and the United Church of Christ.
 The church was designed by Richard M. Upjohn, and its distinctive interior is largely the work of Tiffany & Co.
Covenant Health System is an American health care provider which serves West Texas and Eastern New Mexico.
 It has about 1,300 beds in its five primary acute-care and specialty hospitals; it also manages about a dozen affiliated community hospitals.
 Covenant Health System, part of the St. Joseph Health System, also maintains a network of family health care and medical clinics.
 Covenant Health System's major facilities are Covenant Medical Center, Covenant Specialty Hospital, and Covenant Women's and Children's Hospital.
 The health system also includes some 20 clinics and 50 physician practices, and its extensive outreach programs target isolated rural communities with mobile services.
 Covenant Health was founded in 1998 through the merger of two of Lubbock's health care facilities, St. Mary of the Plains Hospital and the Lubbock Methodist Hospital System.
Alor is an American luxury jewelry, watch and lifestyle brand founded by Jack and Sandy Zemer in 1979.
 Alor specializes in designing, creating, and manufacturing 18kt gold, diamonds and cable pieces.
 It is headquartered in San Diego, California.
Kristall Smolensk is a Russian worldwide luxury jewelry retailer, headquartered in Smolensk, Russia.
 Kristall Production Corporation was founded in 1963 for the development of the diamond polishing industry in Russia.
 The company has become the major polished diamonds manufacturer in Europe, and one of the leading diamond centres in the world.
 Kristall Smolensk diamonds is a sightholder of two prestigious rough suppliers in the world, De Beers and Alrosa.
Kuhn & Komor, also known colloquially as "K&K", was a Hungarian multinational luxury jewelry and specialty retailer, having headquarters in Shanghai, China.
 K&K produced jewelry, sterling silver, china, crystal, stationery, and personal accessories.
 K&K was renowned in East Asia for its luxury goods, also being called the "Asprey of Asia."
Blue Nile is an online specialty retailer of fine jewelry.
 Blue Nile was founded in 1999 and today is the largest online retailer of diamonds.
 Blue Nile is based in Seattle, Washington and competes with traditional jewelry stores such as Tiffany & Co., and online retailer stores such as James Allen, Belgium Diamonds, Ringsberry.com.
eClarity Pte Ltd is an online specialty retailer of jewelry.
 eClarity was registered in year 2000 and today owns an online diamonds database with more than 20,000 pieces of diamonds, 400 designs of wedding bands, and other jewelry.
 eClarity is based in Singapore, and competes with traditional jewelry retail chain stores, and global online retailer stores such as ringsberry and Blue Nile Inc..
 The key feature of eClarity is customization of engagement ring, wedding jewelry, and wide range of online database of diamonds.