Materials glossary / Lab-grown and simulant
Lead-glass-filled ruby
On the label: Glass-filled ruby · Lab-grown and simulant · a rule or standard applies
What it is
Low-grade corundum with its fractures filled with lead glass to make it transparent; fragile, damaged by heat and household chemicals, and must be disclosed as 'composite' or 'glass-filled'.
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.