Journal

Diamond: Carbon Perfected Under Pressure

Diamond holdsa singular position.Not because it's rarein an absolute sense.Because of what it's made of.And what that lets it do with light.The Simplest Chemistry, the Hardest ResultOne element.Car...

Tourmaline: The Gemstone With Nearly Every Color

If any stone resistsa single defining color —it's tourmaline.Sometimes,several colors,in one crystal.Chemistry Built for DiversityIron. Manganese. Chromium. Copper.Each one, a different color.Green...

Spinel: The Gemstone Once Mistaken for Ruby

For centuries,spinel lived in ruby's shadow.Some of history's most famous "rubies" —in royal crowns, in legend —were spinel all along.The Great Mistaken IdentityBoth colored by chromium.Both born o...

Garnet: A Family of Gemstones, Not Just One Color

Garnet is called"the January birthstone"and left there.That undersells it.It is not one stone.It is a family.A Family, Not a Single VoicePyrope. Almandine. Spessartine.Grossular. Andradite. Uvarovi...

Peridot: The Gemstone That Sometimes Falls From the Sky

Peridot and Ancient EgyptIf asked which stone belongs most to Egypt,many would guess lapis lazuli.But the one truly nativewas peridot.Three thousand years ago,Egyptians mined itfrom a volcanic isla...

Sapphire: One Mineral, Every Color but Red

Sapphire is corundumin every color but red.One exclusion.Endless range.What Makes Blue, BlueIron and titanium,in careful balance.Too much iron —ink.The right balance —cornflower.The blue that built...

Ruby: Corundum's Rarest Expression of Red

Ruby is corundum,the same species as sapphire.One element makes the difference.Chromium.It gives the red.It gives the rarity.An Element That Cuts Both WaysChromium colors.Chromium also fractures.Fi...

Emerald: The Gemstone That Embraces Imperfection

Of all colored stones,emerald asks the most of us.Not for perfection.For acceptance.A Stone That Keeps Its HistoryEmerald is beryl,colored green by chromium.Unlike diamond,it does not hide what it ...