Look-alikes: what a material gets mistaken for
- Diamondvs moissanite, cubic zirconia
- Lapis lazulivs sodalite, dyed howlite or jasper
- Turquoisevs dyed howlite or magnesite, reconstituted or stabilised turquoise
- Ambervs copal (young resin), pressed amber
- Jetvs vulcanite, black glass ("French jet")
- Pearlvs glass beads with pearl essence, plastic
- Jadevs serpentine ("new jade"), aventurine, chrysoprase, dyed quartz
- Coralvs dyed bamboo coral, impregnated sponge coral
- Ivoryvs bone, vegetable ivory (tagua)
- Tortoiseshellvs dyed horn, celluloid and acetate
- Ruby, sapphire, emeraldvs synthetic (Verneuil, from 1902), spinel and garnet
- Goldvs plated and gold filled, pinchbeck and gilt brass
- Silvervs silver plate (EPNS), alpaca, nickel silver