Which term is used to denote a frosted rough diamond, also known as 'Bark'?

Which term is used to denote a frosted rough diamond, also known as 'Bark'?

• A. Alluvial deposit
• B. Annealing
• C. Average girdle diameter
• D. Bast

Answer: (D)

Think of a rough diamond with a frosted, matte surface rather than a shiny, glassy one. In diamond terminology that frosted appearance is described with the word bark, and sometimes you’ll see it written as bast. This label specifically captures the texture of the rough itself, which helps gemologists and cutters anticipate how the stone will behave when cut and how light will interact with it later. The other terms point to something different: where the diamond originated (alluvial deposit), a heat treatment process (annealing), or a measurement used after cutting (average girdle diameter). None of those describe the surface texture of a frosted rough diamond, which is why bark (bast) is the correct descriptor.

Think of a rough diamond with a frosted, matte surface rather than a shiny, glassy one. In diamond terminology that frosted appearance is described with the word bark, and sometimes you’ll see it written as bast. This label specifically captures the texture of the rough itself, which helps gemologists and cutters anticipate how the stone will behave when cut and how light will interact with it later.

The other terms point to something different: where the diamond originated (alluvial deposit), a heat treatment process (annealing), or a measurement used after cutting (average girdle diameter). None of those describe the surface texture of a frosted rough diamond, which is why bark (bast) is the correct descriptor.