Among the oldest diamond rings ever found is a Roman piece dating to roughly the 2nd or 3rd century AD. It's a simple gold band set with a small, uncut diamond - not faceted in the modern sense, but an octahedral crystal in its natural form. The stone is still intact.
It sits in a museum case today, small and yellowish by modern standards, largely unheralded among other ancient jewellery. But it was a diamond, in a ring, nearly two thousand years ago.
The Romans knew about diamonds, though they knew almost nothing of their composition. They called them "adamas" - the unconquerable - and valued them primarily for their hardness. The belief that diamonds were indestructible made them spiritually significant: wearing one was thought to confer strength and invincibility. They were amulets as much as ornaments.
Polishing and faceting diamonds wasn't possible until the 14th century, when lapidary techniques improved enough to cut stone against stone. Before that, diamonds were used uncut, their natural crystal form set as found.
The jump from ancient Roman amulet to modern diamond engagement ring is 1,800 years of technical development, cultural evolution, and marketing. The stone didn't change. Human uses of it accumulated around it.
When you hold a diamond ring today, you're holding the latest layer of a very long story. The stone doesn't know any of this. You do.
