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21Body piercing — For other uses, see Piercing (disambiguation). Nipple piercings, vertical labret piercing and stretched ears Body piercing, a form of body modification, is the practice of puncturing or cutting a part of the human body, creating an opening in… …
22Carat (mass) — This article is about the unit of mass used for gemstones and pearls. For the purity scale used for gold, see carat (purity). The carat is a unit of mass equal to 200 mg (0.2 g; 0.007055 oz) and is used for measuring gemstones and pearls.… …
23Diamond — This article is about the mineral. For the gemstone, see Diamond (gemstone). For other uses, including the shape ◊, see Diamond (disambiguation) …
24Gold — This article is about the metal. For the color, see Gold (color). For other uses, see Gold (disambiguation). platinum ← gold → mercury …
25Obsidian — For other uses, see Obsidian (disambiguation). Obsidian Obsidian from Lake Cou …
26Platinum — This article is about the chemical element. For other uses, see Platinum (disambiguation). iridium ← platinum → gold Pd ↑ Pt ↓ Ds …
27Stainless steel — Iron alloy phases Ferrite (α iron, δ iron) Austenite (γ iron) Pearlite (88% ferrite, 12% cementite) …
28Silver — This article is about the chemical element. For the color, see Silver (color). For other uses, see Silver (disambiguation). palladium ← silver → cadmium …
29Sapphire — For other uses, see Sapphire (disambiguation). Sapphire The 423 carat (85 g) blue Logan sapphire General Category Oxide mineral …
30Tourmaline — Schorl Tourmaline General Category Cyclosilicate Chemical formula (Ca,K,Na,[ …
