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2. Body piercing materials - Wikipedia

   en.wikipedia.org/wiki/Body_piercing_materials

   The quality varies widely with different gems, and it can be hard to find stones big enough without cracks and scratches. Some stones may affect the body such as malachite which contains copper that can discolor the skin. Others may contain lead [15] or arsenic or other hazardous materials. However, stones are generally not a problem for the ...

3. Ring (jewellery) - Wikipedia

   en.wikipedia.org/wiki/Ring_(jewellery)

   Rings fit snugly around or in the part of the body they ornament, so bands worn loosely, like a bracelet, are not rings. Rings may be made of almost any hard material: wood, bone, stone, metal, glass, jade, gemstone or plastic. They may be set with gemstones (diamond, ruby, sapphire or emerald) or with other types of stone or glass.

4. Titanium ring - Wikipedia

   en.wikipedia.org/wiki/Titanium_ring

   Titanium rings are jewelry rings or bands which have been primarily constructed from titanium. The actual compositions of titanium can vary, such as "commercial pure" (99.2% titanium) or "aircraft grade" (primarily, 90% titanium, 6% aluminum, 4% vanadium), and titanium rings are often crafted in combination with other materials, such as gemstones and traditional jewelry metals.

5. Jewellery - Wikipedia

   en.wikipedia.org/wiki/Jewellery

   These may be made of glass, gemstones, metal, wood, shells, clay and polymer clay. Beaded jewellery commonly encompasses necklaces , bracelets , earrings , belts and rings . Beads may be large or small; the smallest type of beads used are known as seed beads , these are the beads used for the "woven" style of beaded jewellery.

6. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Lab-created stones tend to have a more vivid color since impurities common in natural stones are not present in the synthetic stone. Synthetics are made free of common naturally occurring impurities that reduce gem clarity or color unless intentionally added in order to provide a more drab, natural appearance, or to deceive an assayer.

7. Corundum - Wikipedia

   en.wikipedia.org/wiki/Corundum

   Corundum is a crystalline form of aluminium oxide (Al 2 O 3) typically containing traces of iron, titanium, vanadium, and chromium. [3] [4] It is a rock-forming mineral.It is a naturally transparent material, but can have different colors depending on the presence of transition metal impurities in its crystalline structure. [7]