Rainbow Obsidian Slab - 01

This stone pairs grounding with gentle release. Its energy acts like a calm buffer, absorbing “static” so you can feel what’s true without being flooded by it. Use it when old stories surface or when the nervous system is wired-tired; slow the breath, place the stone over your heart, and let your exhale be longer than your inhale. The subtle rainbow sheen reminds the mind that light exists within shadow—helpful for integrating lessons rather than bypassing them. Journal after a few minutes of breathing to name what you’re ready to let go. Over time, rainbow obsidian helps rebuild trust in your emotional resilience and restores a stable sense of presence

Rainbow obsidian is an amorphous volcanic glass (silica-rich melt quenched so quickly it doesn’t crystallise). Typical values:  RI ~1.49–1.51, SG ~2.35–2.45, conchoidal fracture, vitreous lustre. The “rainbow” arises from thin-film interference: ultra-thin layers and/or nanoscopic inclusions (often iron-oxide) scatter light to produce bands of green, purple, gold, or rose when polished into domes. Because it’s glassy and brittle, edges can be razor-sharp (ancient cutting tools). Prolonged exposure to heat or weathering can cause devitrification (partial crystallisation to perlite or cristobalite). Quality material is abundant in Mexico (alongside sheen and gold-sheen varieties) as well as the western USA.

Mohs Hardness Scale: 5–5.5

Treat with care to prevent chipping and scratching. Light safe and water safe. 
To learn more about Crystal Care click here

At Uluna, we are deeply committed to offering crystals that are not only beautiful but also ethically sourced and of the highest quality. Ethical sourcing means ensuring that the crystals we provide are mined under fair conditions, respecting both the environment and the workers involved. We also recognise that many crystals undergo processes like cutting and polishing in  factories far away from their mined locations, so we remain diligent about maintaining our integrity throughout the supply chain sourcing locally and directly where possible.

Our dedication to quality is upheld by our in-house gemmologist, who brings over 15 years of expertise to every piece we offer. Each crystal is carefully tested, correctly identified, and certified as natural, with any treatments fully disclosed. Unlike lab-grown or misrepresented stones often sold as natural, our crystals are authentic and come with an authenticity card, guaranteeing their provenance and purity so you can feel safe with each purchase. For us, ethics and quality are non-negotiable values.