Titanium (ASTM F136) is the gold standard for healing piercings. Gold is safe only at 18ct (750/1000) with verified nickel-free alloy. Here is the full material comparison, karat by karat.
What the full article covers
For fresh piercings, implant-grade titanium (ASTM F136) is the universal safe default: zero nickel, self-healing passivation, no exceptions.
18ct solid gold (75%, ISO 8654) with verified nickel-free alloy composition is safe for initial piercings, but request the assay certificate.
14ct gold carries higher sensitisation risk because 41.7% of the metal is not gold, and nickel is a common alloy component, especially in white gold.
Gold-plated, gold-filled, and gold vermeil are never safe for any piercing. Plating failure in a moving piercing is inevitable.
Anodised titanium at 20-30V produces a permanent gold tone that is biocompatible and costs a fraction of solid gold.
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First published on poliinternational.com. This is a summary of the original engineering article.
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