It's about as heavy as a Penny
(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 2.5 g. According to a 2010 report by the United States Mint, the cost of manufacturing and distributing a penny is $0.0179 — more than its face-value.
It's about one-and-two-fifths times as heavy as a Playing Card
In other words, 2.50 grams is 1.4 times the weight of a Playing Card, and the weight of a Playing Card is 0.71 times that amount.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 1.8 g. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
It's about three-fifths as heavy as a Die (Dice)
In other words, 2.50 grams 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 4.1 g. 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, 2.50 grams is 1.8 times the weight of a Paper Clip, and the weight of a Paper Clip is 0.56 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 1.4 g. The country of Norway has used the paper clip as something of a national symbol since the end of World War II based on the erroneous notion that the paperclip was invented by a Norwegian, Johan Vaaler. However, the paperclip had already been in existence for at least 30 years by the time of Vaaler patented his paperclip design.
It's about half as heavy as a sheet of Paper
In other words, 2.50 grams is 0.5 times the weight of a sheet of Paper, and the weight of a sheet of Paper is 2 times that amount.(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
The weight of a ream (500 sheets) of 9,100 grams, 8.5 inch x 11 inch paper is 2,000 grams, each sheet weighing 5 g. Paper of this size has a thickness of 0.004 caliper (0.1 mm).
It's about two-fifths as heavy as a Quarter
In other words, 2.50 grams 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)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 5.670 g each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
It's about two-and-a-half times as heavy as a Jelly Bean
In other words, 2.50 grams is 2.3 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 0.43 times that amount.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 1.10 grams. President Ronald Reagan cited jelly beans as his favorite candy and 3,200,000 grams of the candies were served at his first inauguration in 1981.