Quizmo

Quiz on Diamonds

20 questions · June 28, 2026

Below is the full Quizmo quiz devoted to the theme "Diamonds": each question, its four options, the correct answer highlighted and, where available, its source. A chance to brush up on your general knowledge and then test what you know.

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Question 1

Easy

What chemical element are all diamonds made of?

Source: Diamonds are pure carbon — the very same element as the graphite in a pencil.

Question 2

Easy

What single property is diamond most famous for?

Source: Diamond is the hardest natural material known, scoring a perfect 10 on the Mohs scale.

Question 3

Easy

The diamond is the birthstone for which month?

Source: Babies born in April get the priciest birthstone of all — the diamond.

Question 4

Easy

Diamonds that fund armed conflicts are commonly nicknamed what?

Source: 'Blood diamonds' inspired a whole Leonardo DiCaprio film and a global certification scheme.

Question 5

Easy

Which wedding anniversary is traditionally marked with diamonds?

Source: Silver is 25, gold is 50, but you have to reach 60 years for diamonds.

Question 6

Easy

Which company coined the slogan 'A Diamond Is Forever'?

Source: De Beers's 1947 slogan single-handedly made diamonds the standard engagement gem.

Question 7

Easy

A diamond's carat actually measures its what?

Source: Carat is purely weight — one carat equals exactly 0.2 grams, not a measure of size.

Question 8

Easy

Which singer released the 2012 chart-topping hit 'Diamonds'?

Source: Rihanna's 'Diamonds' was actually written by Sia in just 14 minutes.

Question 9

Easy

Who sang 'Diamonds Are a Girl's Best Friend' in the 1953 film?

Source: Marilyn Monroe performed it in 'Gentlemen Prefer Blondes' — Audrey often gets the credit by mistake.

Question 10

Easy

Which gem is most often used as a cheap diamond imitation?

Source: Cubic zirconia is so convincing that even jewelers need a loupe to spot it.

Question 11

Medium

Which actor played 007 in the film 'Diamonds Are Forever'?

Source: Sean Connery returned for one last official Bond outing in 1971's diamond-smuggling caper.

Question 12

Medium

Where deep inside the Earth do natural diamonds form?

Source: Diamonds crystallize roughly 150 km down in the mantle, then ride magma to the surface.

Question 13

Medium

What color is the legendary Hope Diamond?

Source: The Hope Diamond's deep blue comes from traces of boron — and it even glows red under UV light.

Question 14

Medium

Which of these is one of a diamond's famous '4 Cs'?

Source: The 4 Cs are cut, color, clarity and carat — not the carbon it's made of.

Question 15

Medium

The Koh-i-Noor diamond sits among whose crown jewels?

Source: The Koh-i-Noor is set in the British Crown — and India, Pakistan and Iran all want it back.

Question 16

Medium

Which country mines the most diamonds today by volume?

Source: Russia's Siberian mines now out-produce South Africa, the country diamonds are most linked with.

Question 17

Medium

A diamond splitting light into rainbow flashes is showing its what?

Source: 'Fire' is the jeweler's term for the rainbow sparkle, distinct from white 'brilliance'.

Question 18

Hard

Which volcanic rock carries most diamonds up toward the surface?

Source: Kimberlite pipes are nature's diamond elevators, named after Kimberley in South Africa.

Question 19

Hard

Heated hot enough in air, a diamond burns into which gas?

Source: Being pure carbon, a diamond will literally burn away into carbon dioxide at around 850°C.

Question 20

Hard

Which is the rarest and most valuable natural diamond color?

Source: True red diamonds are so scarce that fewer than 30 are known to exist worldwide.

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