Turquoise
On the label: Turquoise · Gemstone
What it is
A copper-aluminum phosphate, opaque blue to green, Mohs 5 to 6 and porous. Most commercial turquoise is stabilized with resin; 'reconstituted' turquoise is powder in resin, and some is dyed howlite.
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: Opaque, blue-to-green mineral. Q165254 →
In the research
25 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Identification of circadian rhythm-related diagnostic biomarkers and immune subtypes in allergic rhinitis based on WGCNA and machine learning approaches · American journal of otolaryngology, 2026
- Coordinated microRNA-mRNA regulatory remodelling across the compressed maturation of the African killifish (Nothobranchius furzeri) · bioRxiv : the preprint server for biology, 2026
- Nasopharyngeal swab transcriptomics identifies divergent molecular signatures in adenoid hypertrophy and allergic rhinitis comorbidity · Frontiers in immunology, 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
8 on the siteMatched from the words in the supplier's listing; the full material line is on each product page.
Made in the USA
Made in the USA
Made in the USA
Made in the USA
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.