It's about 6,500 times as heavy as a Human Heart
It's about one-six-thousand-five-hundredth as heavy as The Brooklyn Bridge
In other words, 31,000,000 grains is 0.0001508 times the weight of The Brooklyn Bridge, and the weight of The Brooklyn Bridge is 6,631 times that amount.(a.k.a. New York and Brooklyn Bridge) (Manhattan and Brooklyn, New York City, New York) (total weight)
The total weight of the Brooklyn Bridge is approximately 205,600,000,000 grains. In a promotional event to prove the bridge's stability shortly after it opened, entertainer P. T. Barnum led a parade of 21 elephants across it in May of 1884.
It's about 10,000 times as heavy as a Hamster
In other words, the weight of a Hamster is 0.0001 times 31,000,000 grains.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 3,000 grains. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 400,000 grains of food in their borrows.
It's about one-ten-thousandth as heavy as The Statue of Liberty
In other words, 31,000,000 grains is 0.00008150 times the weight of The Statue of Liberty, and the weight of The Statue of Liberty is 12,300 times that amount.(a.k.a. Liberty Enlightening the World, a.k.a. La Liberté éclairant le monde) (total weight, including foundation)
The total weight of the Statue of Liberty, including her base is roughly 380,000,000,000 grains. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.
It's about 10,000 times as heavy as a Billiard Ball
In other words, 31,000,000 grains is 12,322.981366460 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.0000811491935483850 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 2,406.250 grains and 2,625 grains. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about 10,000 times as heavy as a Puck (Hockey)
In other words, 31,000,000 grains is 12,322.981366460 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.0000811491935483850 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 2,406.250 grains and 2,625 grains. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about 15,000 times as heavy as a Baseball
In other words, 31,000,000 grains is 13,825.7839721250 times the weight of a Baseball, and the weight of a Baseball is 0.000072328629032260 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 2,187.50 grains and 2,296.8750 grains. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).