It's about as heavy as a Penny.
(United States) (formally one-cent coin) (Union shield design, 2010-present)
It's about one-and-two-fifths times as heavy as a Playing Card.
In other words, the weight of a Playing Card is 0.71 times 2,500 miligrams.(ISO 216 B8 size, 2.5" x 3.5")
It's about three-fifths as heavy as a Die (Dice).
In other words, 2,500 miligrams is 0.61 times the weight of a Die (Dice), and the weight of a Die (Dice) is 1.6 times that amount.(for six-sided, 16 mm, rounded cube)
A die, of the size most commonly used in board games and casinos, typically weight 4,100 miligrams. The use of dice and dice-like tools predates written history, with the oldest known examples belonging to a 5,000-year old backgammon set uncovered during an archaeological dig in modern-day Iran.
It's about one-and-four-fifths times as heavy as a Paper Clip.
In other words, the weight of a Paper Clip is 0.56 times 2,500 miligrams.(average)
It's about half as heavy as a sheet of Paper.
It's about two-fifths as heavy as a Quarter.
In other words, 2,500 miligrams is 0.4409 times the weight of a Quarter, and the weight of a Quarter is 2.268 times that amount.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
It's about two-and-a-half times as heavy as a Jelly Bean.
In other words, the weight of a Jelly Bean is 0.43 times 2,500 miligrams.(for Jelly Belly beans; approximate)