Diamond

Diamonds are 1 to 3.5 billion years old, formed deep in Earth's mantle at depths of 100-200 km, then carried to the surface by ancient volcanic eruptions. The first diamonds were mined in India along the Krishna River around 4 BC and were treasured for their supernatural hardness — the Sanskrit word for diamond, vajra, also means thunderbolt. Roman naturalist Pliny the Elder wrote in the 1st century AD that diamond was the most valuable substance in the universe. The Indian monopoly on diamond supply lasted nearly 2,000 years until Brazilian discoveries in 1725 and South African strikes in 1867 reshaped the global market. The De Beers diamond cartel was founded in 1888; their 1947 advertising campaign — "a diamond is forever" — singlehandedly created the modern engagement-ring tradition that did not exist before that decade.

Diamond's name comes from the Greek adamas, meaning unconquerable, untamable. Across cultures the gem represents what cannot be broken: unwavering love, mental clarity, divine truth. In Hindu tradition diamond is associated with the planet Venus and is given to bring spiritual purity. Medieval Europeans believed diamond made warriors invincible in battle. In modern crystal healing, diamond is considered the "master healer" — said to amplify the energy of every other stone it touches. The colorless variety symbolizes the kind of clarity that cuts through illusion; colored diamonds (pink, blue, yellow) carry their own meanings tied to chakras and emotional states.

The Hope Diamond — a 45.52-carat deep-blue diamond now at the Smithsonian — is rumored to bring misfortune to its owners (multiple deaths and ruin documented over 400 years). The Cullinan Diamond, found in 1905 South Africa at 3,106 carats raw, was cut into nine major stones now in the British Crown Jewels. The Koh-i-Noor ("Mountain of Light") was passed between Mughal, Persian, Afghan, and Sikh rulers before settling into the British monarch's crown — and remains controversial. The Pink Star, a 59.6-carat oval, sold for $71.2 million in 2017, the highest price ever paid for any gemstone at auction.

Diamond is the hardest natural substance (Mohs 10) — only another diamond can scratch it. Despite this, diamonds can chip if hit at the right angle along their cleavage planes. Clean with warm water, dish soap, and a soft brush. Ultrasonic and steam cleaners are safe for solitaires but risky for fancy-cut or fracture-filled stones. Store separately so the diamond does not scratch other gems. Have prongs checked annually by a jeweler — most diamond losses come from worn settings, not stone damage.