Materials glossary / Lab-grown and simulant
Lab-created sapphire
On the label: Lab-grown sapphire · Lab-grown and simulant
What it is
Corundum grown by flame fusion or other methods, the same material as natural sapphire; used in watch crystals and jewelry. Must be described as lab-created or synthetic.
Lab-grown and simulants: Lab-grown stones have the same chemistry as the natural stone; simulants only look like it. Both are legal to sell when described as such.
In the research
No PubMed papers mention this material with jewelry, allergy or eyewear; that is usual for findings and trade terms.
Other lab-grown and simulants
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.