Frequently asked questions

• What gives prehnite its distinctive yellow-green color?

  Prehnite is a calcium aluminum silicate that occurs naturally in a translucent yellow-green to apple-green palette, occasionally drifting toward gray-green or near-colorless. The color comes from trace iron within the mineral structure and is stable — it isn't dye. Prehnite typically shows a soft, slightly cloudy translucence rather than the glassy clarity of faceted gem material, and many strands include subtle internal swirls or included needles of epidote or actinolite. Color depth varies by deposit: Mali material tends toward saturated yellow-green, while South African and Australian rough often runs paler and more mint-toned. Expect strand-to-strand variation rather than uniform color matching across lots.
• Is prehnite typically treated or dyed?

  Prehnite is generally sold untreated. Its natural color is stable enough that dyeing or stabilization isn't standard practice in the bead trade, and most rough is simply cut and polished. That said, treatment should be disclosed — ask before buying if it isn't specified. The translucent quality you see in finished beads is the natural material; cloudy or slightly milky zones are characteristic of prehnite's botryoidal growth habit, not a finish defect. If a strand reads as unusually saturated or uniformly opaque green, it's worth confirming the material is prehnite rather than dyed quartz or a lookalike.
• How does prehnite compare to peridot, chrysoprase, and serpentine?

  All four sit in the green range, but they behave differently. Peridot is harder (6.5–7), transparent, and a saturated olive-green — typically faceted in small sizes. Chrysoprase is a chalcedony with a more opaque apple-green body and waxy luster, harder at 6.5–7. Serpentine is softer (3–6) and often shows mottled patterning resembling jade. Prehnite is the softly translucent option with that characteristic cloudy interior and yellow-green cast. In a mixed-stone design, prehnite reads as the gentlest, most luminous green of the group, which is why it pairs well with pearl, moonstone, and warm metals.
• What jewelry projects suit prehnite best?

  At Mohs 6–6.5, prehnite handles necklaces, earrings, and bracelets well but is borderline for daily-wear rings where harder stones hold up better. The translucent, softly glowing quality shows best in smooth rounds, coins, and pebble shapes where light can travel through the bead; faceted cuts add sparkle but can mute the characteristic inner glow. Smaller sizes (4–6mm) work for delicate layering pieces and bead-woven designs, while 8–10mm rounds and the larger nugget cuts anchor statement strands. Prehnite pairs cleanly with freshwater pearl, labradorite, moonstone, citrine, and yellow or rose gold-fill findings.
• How should finished prehnite jewelry be cleaned and stored?

  Clean with mild soap, lukewarm water, and a soft cloth or soft brush — then dry thoroughly. Skip ultrasonic and steam cleaners; prehnite often contains internal fractures or mineral inclusions that can react poorly to vibration and heat. Avoid prolonged exposure to household chemicals, chlorinated pool water, and acidic substances, which can dull the polish over time. Store prehnite separately from harder stones like quartz, topaz, and corundum to prevent surface scratching, ideally in a soft pouch or lined compartment. Direct sunlight for short periods is fine, but extended UV exposure isn't recommended for any translucent stone holding a polished finish.