Gold
24k=100%gold; 18k=75%gold; 14k=58.3%gold; 1k=4.16666%gold
Silver
925 Sterling Silver = 92.5% silver & 7.5% copper (or other metal)
Stainless Steel; Durable
Pewter
Mixture of tin & lead; Grey metal
Copper
Base metal; reddish-brown metal
Titanium
Lightweight; dark grey color
Aluminum
Lightweight; softer than Titanium
Brass
Mixture of copper & tin; harder than copper
Plastics
Lucite; acrylic resin
Vermeil
Sterling silver coated with 10k gold (at least)
Gold-filled Brass
Brass or brass & copper overlaying a thin layer of 14k gold.
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