Four hundred buyers from around the world join 260 diamond manufacturing and trading firms on International Diamond Week as some 1,500 people are expected to trade more than billion of polished diamonds this week in Ramat Gan, Israel on February 16, 2016. The Israel Diamond Exchange is considered the most secure in the world, covering an area of 100,000 square meters with 3,500 bourse members. (Photo by Nir Alon via ZUMA Wire)

Protesting university students flee as police fire stun grenades outside Parliament in Cape Town, South Africa, Wednesday October 21, 2015. The protests are part of a wave of nationwide protests that have shut down many South Africa universities, which say they are struggling with higher operational costs as well as inadequate state subsidies. (Photo by AP Photo)

A hot air balloon in tortoise shape flies in the air during the Tazaungdaing air balloon festival in Pyin Oo Lwin, Myanmar, 25 November 2015. During the festival, hot air balloons made of multicolored papers and hung with paper lanterns, fireworks and fire sticks are exploded in mid-air. (Photo by Hein Htet/EPA)

Model Natasha Poly poses on the red carpet as she arrives for the screening of the film “Carol” in competition at the 68th Cannes Film Festival in Cannes, southern France, May 17, 2015. (Photo by Eric Gaillard/Reuters)

Natasha Hastings of U.S. on the starting block before the women's 400 metres heats during the 15th IAAF World Championships at the National Stadium in Beijing, China August 24, 2015. (Photo by Lucy Nicholson/Reuters)

Miss Universe contestant Desire Cordero, of Spain, poses for a photo after a news conference for contestants from Latin America and Spain, Monday, January 12, 2015, in Doral, Fla. The Miss Universe pageant will be held on January 25, in Miami. (Photo by Wilfredo Lee/AP Photo)

A model displays a creation for designer Andres Sarda's Fall/Winter 2015 collection, during the Mercedes-Benz Fashion Week in Madrid, February 7, 2015. (Photo by Javier Barbancho/Reuters)

A bride gets ready during a mass wedding ceremony in the old quarters of Delhi February 20, 2015. A total of 12 couples took their wedding vows on Friday during the mass wedding ceremony organised by a Hindu religious organisation, an organiser said. (Photo by Ahmad Masood/Reuters)