Alexandrite
On the label: Alexandrite · Gemstone
What it is
Chrysoberyl that changes from green in daylight to red under incandescent light; rare and costly when natural. Lab-grown alexandrite shows the same change.
Gemstones: Natural gemstones, as mined and cut. Hardness (Mohs scale) says what scratches what; treatment (heat, oil, dye) must be disclosed under FTC rules.
Wikidata: Variety of the mineral chrysoberyl. Q1765371 →
In the research
66 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Comparison of the efficacy and safety of 755-nm picosecond alexandrite laser with diffractive lens array vs. fractional microneedle radiofrequency for the treatment of facial photo · Frontiers in medicine, 2026
- Efficacy and Safety of Small-Spot 755 nm Picosecond Laser-Induced Optical Breakdown for Novel Photomechanical Skin Ablation in Asian Patients · Lasers in surgery and medicine, 2026
- Integrated Topical Skincare Enhances Picosecond Laser Treatment Outcomes for Photoaging: A Prospective Split-Face Trial · Aesthetic plastic surgery, 2026
A paper is a paper, not a verdict: titles are listed so you can read them, and a study on one fabric or one filter says little about the piece in your hand.
Pieces whose listing names it
1 on the siteMatched from the words in the supplier's listing; the full material line is on each product page.
Other gemstones
Clasp & Lens describes materials from the public record and does not appraise, grade or test pieces; what a listing states is the supplier's statement. If a piece causes a rash, take it off; a reaction that spreads or blisters is a doctor's question, and sunglasses are no substitute for impact-rated eye protection where that is required.