Metamorphic Rocks: Where Pressure Becomes Beauty

"Changed rock."

A flat name
for a process that makes
some of the world's finest gems.

What "Metamorphic" Actually Means

Existing rock.
Heat. Pressure. Chemical fluids.

Enough to alter,
not enough to melt.

Deep in mountain-building zones,
over millions of years.

Why Metamorphism Creates Gemstones

Minerals recrystallize.
Larger. More ordered.

Limestone, becoming marble.
Aluminum, nearby.

Chromium, coloring corundum
within the marble matrix.

Marble-Hosted Ruby

Myanmar's Mogok.
Tajikistan.

Marble —
calcium-rich, iron-poor.

Iron dulls red.
Low iron lets red stay pure.

Beyond Ruby

Garnet —
forms across wide conditions,
which is why the family is so varied.

Jadeite —
high pressure, lower heat.
Found only in subduction zones.

Rarer than its cousin, nephrite.

Reading the Rock Behind the Gem

A ruby's marble origin
explains its purity.
Explains its inclusions.

Evidence,
quite literally,
of the rock it once called home.