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Article: Diamond simulant

Diamond simulant

Diamond Simulant Properties

  • Diamond simulants have gemological characteristics similar to those of a diamond.
  • Simulants can be artificial, natural, or a combination of both.
  • Simulants possess certain desired characteristics such as dispersion and hardness.
  • Trained gemologists can distinguish natural and synthetic diamonds from simulants through visual inspection.
  • High-leaded glass and cubic zirconia are the most common diamond simulants.

Differential Properties of Diamond and Simulants

  • Simulants have one or more features that differentiate them from diamond.
  • Non-destructive testing is preferred for distinguishing diamond from simulants.
  • Visual properties are important for differential testing.
  • External flaws and poor polish can separate simulants from diamond.
  • Hardness tests using glass or scratch plates are not reliable for identification.

Durability and Density

  • Diamond is one of the hardest naturally occurring materials known.
  • Diamond gemstones are typically free of scratches.
  • Simulants must be very hard relative to most gems.
  • Simulants can be identified by their external flaws and poor polish.
  • Specific gravity or density can be used to identify simulants.

Optics and Color

  • Diamonds have high refractive index (RI) and dispersion, which affect brilliance and fire.
  • Simulants with low RI and dispersion appear dull, while those with high RI and dispersion look unreal.
  • Simulants can be separated based on their RI using reflectivity meters.
  • Diamond is isotropic, while most minerals are anisotropic.
  • Diamond may fluoresce under longwave ultraviolet light, with blue fluorescence being common.

Color and Fluorescence

  • Most colorless diamonds have a tint of yellow or brown, while simulants can be completely colorless.
  • Colored diamond simulants imitate fancy diamonds.
  • Simulants tend to have uniform properties, while natural diamonds vary.
  • Different fluorescence responses among stones in a diamond ring indicate they are likely not diamonds.
  • Identical fluorescence among stones suggests they are unlikely to be diamonds.

Diamond simulant Mentions

Diamond simulant Data Sources

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