Question: Where are the headquarters of this American luxury jewelry and specialty retailer, where silversmiths created the Sprint Cup?

Context articles: Blue Nile (company)
2008 Ford 400
Sprint Cup (trophy)
Eclarity
2009 NASCAR Banking 500 only from Bank of America
2013 Ford EcoBoost 400
Kuhn &amp; Komor
2016 Blancpain GT Series Sprint Cup
Marcus &amp; Co.
Tiffany &amp; Co.

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.
The 2008 Ford 400, a 400.5 mi race, was the concluding event of the 2008 NASCAR Sprint Cup season along with the 2008 Chase for the Sprint Cup, and decides the Sprint Cup Champion for the 2008 season, this race was historic for being the race where Jimmie Johnson became the second driver (after Cale Yarborough) to win the Sprint Cup title three years in a row.
 The 267-lap race on the 1.5 mi track was held on November 16 at Homestead-Miami Speedway in Homestead, Florida.
 ABC covered the race beginning at 3 PM US EST and MRN along with Sirius Satellite Radio had radio coverage starting at that same time.
The Sprint Cup Trophy is the trophy that was presented to the championship winner of the premier series of the National Association for Stock Car Auto Racing (NASCAR) from 2004 to 2016.
 It is made of sterling silver with a wood base and it depicts two checkered flags in flight, and was created by renowned silversmiths Tiffany & Co., whose other major championship trophies in sports have included the World Series (Major League Baseball) Commissioner's Trophy, the NFL's Vince Lombardi Trophy, given to the champions of the Super Bowl and the Larry O'Brien Trophy, handed to the playoff champions of the NBA following the NBA Finals.
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.
The 2009 NASCAR Banking 500 only from Bank of America was a NASCAR Sprint Cup Series stock car race held on October 17, 2009 at Lowe's Motor Speedway in Concord, North Carolina.
 The race was the thirty-first of the 2009 NASCAR Sprint Cup season, the fifth of the Chase for the Sprint Cup, and the only race scheduled at night during the ten-race Chase for the Sprint Cup that ended the season.
The 2013 Ford EcoBoost 400 was a NASCAR Sprint Cup Series stock car race that was held on November 17, 2013, at Homestead Miami Speedway in Homestead, Florida.
 Contested over 267 laps, it was the thirty-sixth and final race in the 2013 NASCAR Sprint Cup Series, as well as the final race in the ten-race Chase for the Sprint Cup, which ends the season.
 Denny Hamlin won the race.
 Matt Kenseth finished second while Dale Earnhardt, Jr., Martin Truex Jr. and Clint Bowyer rounded out the top five.
 Jimmie Johnson finished ninth to take his sixth Sprint Cup title.
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."
The 2016 Blancpain GT Series Sprint Cup was the fourth season following on from the demise of the SRO Group's FIA GT1 World Championship (an auto racing series for grand tourer cars), the third with the designation of Blancpain Sprint Series or Blancpain GT Series Sprint Cup.
 After developing their partnership, Blancpain and the SRO decided that 2016 would see both the Sprint and Endurance Series further integrated into the Blancpain GT Series, putting the emphasis on the prestigious overall drivers' and manufacturers' titles causing the Sprint Series name to change from Blancpain Sprint Series to Blancpain GT Series Sprint Cup.
Marcus & Co. was an American luxury jewelry retailer from 1892 to 1962 in New York City.
Tiffany & Company (known colloquially as Tiffany or Tiffany's) is an American luxury jewelry and specialty retailer, headquartered in New York City.