Raw material
Real natural stones
Natural color, texture, and pattern. No two pieces are the same.
Natural stones, selected for light.
Crystal Library
Each Spire starts with a real crystal. We look for color, pattern, and the way light moves through the stone.
Explore our new Spire CollectionWhy selection matters
Chosen before it’s cut.
Light check
Checked for light
We test how the crystal carries a soft glow before it is cut.
Spire fit
Cut and fit for Spire
Each point is shaped to fit the shell and protect the light inside.
Explore the library
Origins, structure, light.
A working index of the crystals we use in Spire. Each profile is based on the printed card included in the box, refined for sourcing, formation, and material selection.
Choose a crystal
Family
Quartz family
Structure
SiO2 with trace iron
01
Amethyst
Violet to deep purple
Amethyst is a violet variety of quartz. Its color comes from trace iron reacting to natural radiation over geological time, gradually turning clear quartz into rich shades of purple.
It is commonly found in volcanic regions and geodes, where silica-rich fluids cool inside cavities of lava rock. Heat can sometimes shift related quartz toward golden tones, creating natural citrine.
We look for saturated natural color, stable structure, and a clean internal path for light. Inclusions are welcome when they add depth without weakening the finished point.
Major deposits
Brazil, Uruguay, United States, Appalachian belt, Ontario, Ural region, Zambia, Namibia, Madagascar, India, Sri Lanka, Japan
Historical note
For centuries, amethyst has been associated with calm, clarity, and emotional balance.
Archive
Past RFH Spires.
Past stones from the RFH archive. Some may or may not return, depending on sourcing and material availability.
Explore our new Spire Collection
Carnelian
Warm orange stone from the RFH archive.
Black Rutilated Quartz
Clear quartz with dark needle-like lines.
Prehnite
Soft green stone from an earlier RFH run.
Blue Fluorite
Soft blue fluorite from an earlier RFH run.
Reserved for Humans
Reserved for Humans is an independent jewelry brand based in DeLand, Florida. We explore jewelry built around light and natural materials. Spire is our first release: a light-up crystal necklace that reveals the hidden textures, inclusions, and formations inside natural stone.
Spire is the starting point for a broader line of illuminated jewelry, with more designs currently in development.
Our story