Various quartz watch movements of a of Swiss manufacturer Ronda are seen on display at the Baselworld watch and jewellery fair in Basel, Switzerland March 21, 2019. REUTERS/Arnd Wiegmann

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan faces off with Samuel Vargas during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Trainer Joe Goossen (R) covers Amir Khan as he struggles to make the weight during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and trainer Joe Goossen react as he struggles to make the weight during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and trainer Joe Goossen react as he struggles to make the weight during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and Samuel Vargas during the weigh-in as promoter Eddie Hearn (C) and trainers Joe Goossen (L) and Chris Johnson (R) look on Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Promoter Eddie Hearn looks on as Amir Khan faces off with Samuel Vargas during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Promoter Eddie Hearn looks on as Amir Khan faces off with Samuel Vargas during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Promoter Eddie Hearn looks on as Amir Khan faces off with Samuel Vargas during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Trainer Joe Goossen (R) covers Amir Khan as he struggles to make the weight during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and Samuel Vargas during the weigh-in as promoter Eddie Hearn (C) looks on Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Trainer Joe Goossen (R) covers Amir Khan as he struggles to make the weight during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and Samuel Vargas pose during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and Samuel Vargas pose during the weigh-in Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and Samuel Vargas during the weigh-in as promoter Eddie Hearn (C) looks on Action Images via Reuters/Andrew Couldridge

Boxing - Amir Khan & Samuel Vargas Weigh-In - Quartz Restaurant, Arena Birmingham, Birmingham, Britain - September 7, 2018 Amir Khan and Samuel Vargas during the weigh-in Action Images via Reuters/Andrew Couldridge

A 5067 Aquanaut Luce "Misty Blue" watch with Quartz Caliber E23-250SC of Swiss watch manufacturer Patek Philippe is displayed at the Baselworld watch and jewellery fair in Basel, Switzerland March 21, 2018. REUTERS/Arnd Wiegmann

A custom-designed quartz stairwell is seen in the new Apple Visitor Center in Cupertino, California U.S. November 17, 2017. The stair design is the same as those in the new Apple Park across the street. REUTERS/Elijah Nouvelage

An Apple employee is seen at the foot of a custom-designed quartz stairwell in the new Apple Visitor Center in Cupertino, California, U.S. November 17, 2017. The stair design is the same as those in the new Apple Park across the street. REUTERS/Elijah Nouvelage

Customers descend a custom-designed quartz stairwell in the new Apple Visitor Center in Cupertino, California November 17, 2017. The stair design is the same as those in the new Apple Park across the street. REUTERS/Elijah Nouvelage

A worker throws quartz sand in an electric arc furnace in a steel factory of Store Steel in Store, Slovenia November 17, 2016. REUTERS/Srdjan Zivulovic

The $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", is revealed at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

The $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", is revealed at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

The $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", is revealed at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

The $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", is revealed at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

The $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", is revealed at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian TPX IMAGES OF THE DAY

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

Model Lily Aldridge reveals the $2 million Mouawad Victoria's Secret Fantasy Bra, dubbed the "Fireworks Fantasy Bra", at the Victoria's Secret store in Santa Monica, California November 2, 2015. The bra dazzles with over 6,500 precious gems of diamonds, blue topaz, yellow sapphires and pink quartz all set in 18-karat gold. REUTERS/Kevork Djansezian

A Peugeot Quartz concept car is pictured during the media day at the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 15, 2015. REUTERS/Kai Pfaffenbach

A Peugeot Quartz concept car is pictured during the media day at the Frankfurt Motor Show (IAA) in Frankfurt, Germany, September 15, 2015. REUTERS/Kai Pfaffenbach

U.S. graduate students scrape soil into a dustpan as they try to uncover implements fashioned from quartz that were used 100,000 years ago to prepare animal hides, at Swartkrans cave, northwest of Johannesburg July 9, 2015. The new ground being broken on the rocky hillside 25 km (15 miles) northwest of Johannesburg helps to reveal the material culture of our ancestors a thousand millennia ago, shortly after they had evolved into our species, Homo sapiens. Picture taken July 9. REUTERS/Christa Cameron

U.S. graduate students scrape soil into a dustpan as they try to uncover implements fashioned from quartz that were used 100,000 years ago to prepare animal hides, at Swartkrans cave, northwest of Johannesburg July 9, 2015. The new ground being broken on the rocky hillside 25 km (15 miles) northwest of Johannesburg helps to reveal the material culture of our ancestors a thousand millennia ago, shortly after they had evolved into our species, Homo sapiens. Picture taken July 9. REUTERS/Christa Cameron

Quartz Publisher Jay Lauf poses for photographers as he arrives for a Google and The Atlantic event to celebrate "The Art of Expression" on the National Mall, in Washington, April 24, 2015. The red carpet event is one of a number of pre-parties ahead of the annual White House Correspondents' Association (WHCA) Gala April 25, 2015. REUTERS/Mike Theiler

A mine worker holds a combination of gold, bronze and quartz at "The Progreso" gold mine near La Paz, November 13, 2014. According to local media, the president of the Central Bank of Bolivia (BCB) Marcelo Zabalaga said on Thursday that the falling price of oil and minerals in the international market will not affect the national economy. Picture taken November 13, 2014.REUTERS/David Mercado (BOLIVIA - Tags: BUSINESS POLITICS COMMODITIES)

The Peugeot Quartz Concept car is displayed on media day at the Paris Mondial de l'Automobile, October 2, 2014. The Paris auto show opens its doors to the public from October 4 to October 19. REUTERS/Benoit Tessier (FRANCE - Tags: TRANSPORT BUSINESS)

The Peugeot Quartz Concept car is displayed on media day at the Paris Mondial de l'Automobile, October 2, 2014. The Paris auto show opens its doors to the public from October 4 to October 19. REUTERS/Benoit Tessier (FRANCE - Tags: TRANSPORT BUSINESS TPX IMAGES OF THE DAY)

George Quartz, the events coordinator for the Texas Theater, poses for a photograph near the location where Lee Harvey Oswald was arrested in 1963 for the murder of Officer J.D. Tippit, inside the theater in Dallas, Texas November 8, 2013. The City of Dallas will hold commemoration ceremonies on November 22, 2013 marking the 50th anniversary of the assassination of President John F. Kennedy. REUTERS/Adrees Latif (UNITED STATES - Tags: POLITICS ANNIVERSARY CRIME LAW PORTRAIT)

Jockey Marc Goldstein leads his mount Quartz du Montceau after winning the final race, the Eastwell Manor Handicap Chase, on the last day of racing at Folkestone races in Kent December 18, 2012. Tuesday's fixture was the last of the season, with no more meetings planned for the future, following the failure of talks between the owners and the local council to agree a development plan. REUTERS/Olivia Harris (BRITAIN - Tags: SPORT HORSE RACING)

A gilt-metal, rock crystal, amethyst, rose quartz, chalcedony and cameo-mounted coffret a bijoux, a jewellery casket, is seen as part of the 500 Years: Decorative Arts Europe collection at Christie's auction house in New York April 16, 2010. Less than two years after an unusually long-lived art boom came to an end with lower prices and a decreased supply, bidders have returned to salesrooms, prices are mostly ticking up and records are being set once again. REUTERS/Shannon Stapleton (UNITED STATES - Tags: SOCIETY BUSINESS)

The Bay Tree Faberge egg is displayed during the exhibition "Treasures of Imperial Russia" in Croatia's Adriatic town of Dubrovnik on November 3, 2007. The egg of gold, nephrite, quartz, diamonds, rubies, amethyst, citrines and pearls was presented by Emperor Nicholas 2nd to his mother, Dowager Empress Maria Feodorovna for Easter 1911. REUTERS/Nikola Solic (CROATIA)

The Bay Tree Faberge egg is displayed during the exhibition "Treasures of Imperial Russia" in famous Croatia's Adriatic town of Dubrovnik on November 3, 2007. The egg of gold, nephrite, quartz, diamonds, rubies, amethyst, citrines and pearls was presented by Emperor Nicholas 2nd to his mother Dowager Empress Maria Feodorovna for Easter 1911. REUTERS/Nikola Solic (CROATIA)

Switzerland's Paul von Kaenel (L) and Franz von Arx pose behind a 300 kg quartz piece two days before the opening of an exhibition of crystals they discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

Switzerland's Paul von Kaenel (R) and Franz von Arx pose behind a 300 kg quartz piece two days before the opening of an exhibition of crystals they discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

A security guard stands behind a 300 kg quartz piece two days before the opening of an exhibition of crystals discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

A woman looks at crystals and quartz pieces two days before the opening of an exhibition of crystals discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

A woman looks at crystals and quartz pieces two days before the opening of an exhibition of crystals discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

Security guards stand in front of a 300 kg quartz piece two days before the opening of an exhibition of crystals discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

A security guard looks at a 300 kg quartz piece two days before the opening of an exhibition of crystals discovered in the region of the Saint-Gotthard mount, in Fluelen, near Lucerne, March 29, 2007. REUTERS/Christian Hartmann (SWITERLAND)

A piece of Sandston-quartz rock, said to be over 500 million years old, is seen in Beaconsfield Australia May 7, 2006. Rescue miners need to penetrate a similar rock in order to get to two Australian miners,Todd Russell and Brant Webb, trapped a kilometre (half-mile) underground, who are unlikely to be rescued until Sunday because the last few inches of an escape tunnel will have to be carefully dug by hand, officials said. REUTERS/Tim Mullane

-PHOTO TAKEN 17AUG05- A Brazilian mine worker holds a piece of quartz rock at Ouro Verde gold mine in the village of Senador Jose Porfirio, state of Para, in the Amazon jungle, August 17, 2005. Mine workers climb hundreds of meters drilling the quartz rocks to extract pure gold in the Amazon jungle. Picture taken August 17, 2005.

-PHOTO TAKEN 17AUG05- A Brazilian mine worker crushes pieces of quartz rocks at Ouro Verde gold mine in the village of Senador Jose Porfirio, state of Para, in the Amazon jungle, August 17, 2005. Mine workers climb hundreds of meters drilling the quartz rocks to extract pure gold in the Amazon jungle. Picture taken August 17, 2005.

-PHOTO TAKEN 17AUG05- A Brazilian mine worker washes quartz rocks in the Ouro Verde gold mine complex in the village of Senador Jose Porfirio, state of Para, in the Amazon jungle, August 17, 2005. Mine workers climb hundreds of meters drilling the quartz rocks to extact pure gold in the Amazon jungle. Picture taken August 17, 2005.

-PHOTO TAKEN 17AUG05- A Brazilian mine worker holds a piece of quartz rock at Ouro Verde gold mine in the village of Senador Jose Porfirio, state of Para, in the Amazon jungle, August 17, 2005. Mine workers climb hundreds of meters drilling the quartz rocks to extract pure gold in the Amazon jungle. Picture taken August 17, 2005.

Brazilian mine workers work at Ouro Verde gold mine in the village of Senador Jose Porfirio, state of Para, in the Amazon jungle, August 17, 2005. Mine workers climb hundreds of meters drilling the quartz rocks to extract pure gold in the Amazon jungle. Picture taken August 17, 2005. REUTERS/Paulo Whitaker PW/AH

A Brazilian mine worker drills quartz rocks at Ouro Verde gold mine in the village of Senador Jose Porfirio, state of Para, in the Amazon jungle, August 17, 2005. Mine workers climb hundreds of meters drilling the quartz rocks to extract pure gold in the Amazon jungle. Picture taken August 17, 2005. REUTERS/Paulo Whitaker PW/AH