It's about as heavy as a Nail
It's about seven-tenths as heavy as a Jelly Bean
In other words, 12 grains is 0.710 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 1.40 times that amount.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 18 grains. President Ronald Reagan cited jelly beans as his favorite candy and 49,000,000 grains of the candies were served at his first inauguration in 1981.
It's about three-fifths as heavy as a Paper Clip
In other words, 12 grains is 0.560 times the weight of a Paper Clip, and the weight of a Paper Clip is 1.80 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 22 grains. 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 two-fifths as heavy as a Playing Card
In other words, 12 grains is 0.430 times the weight of a Playing Card, and the weight of a Playing Card is 2.30 times that amount.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 28 grains. 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-tenths as heavy as a Penny
In other words, 12 grains is 0.310 times the weight of a Penny, and the weight of a Penny is 3.20 times that amount.(United States) (formally one-cent coin) (Union shield design, 2010-present)
The weight of a United States penny is 39 grains. 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 four times as heavy as a Raindrop
In other words, the weight of a Raindrop is 0.30 times 12 grains.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 3 grains. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about one-fifth as heavy as a Die (Dice)
In other words, 12 grains is 0.190 times the weight of a Die (Dice), and the weight of a Die (Dice) is 5.30 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 63 grains. 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.