ROUGH DIAMOND GEM VALUATION
Type  & overall size in millimeters
sawable I, II
makeable, cuttable I, II

Quality range
Top gem grade internally clean (VVS1 or better)
average
poor


Color range
- DE
- FG
- colorless
- under
- fancy (light-vivid)

Form
- octahedral & dodecahedral shapes
- cleavages
- cubic crystal
- complex & twinned crystal
- irregulars
- rounds
- sphericals require a window to inspect clarity
- triangular macles & flats.

Face patterns
- convex faces & secondary faces
- trigons
- textured crystal faces
- growth layers & step
- striated edges
- stacked arrangements
- lustrous transparent faces
- glassy crystal faces

Edges
- rounded
- prominent
- abraded

Observed Damages
- small chip or more

Surface appearance
- silky
- lustrous
- transparent

Inclusions & flaws
- subsurface or deeper
- near the corner/edge or in the center
- zoning
- scattered
- minor feather like
- grey or dark inclusions
- severe inclusions
- mapping of main faces and secondary faces for complex crystals.

Cut yield : 50% or more

Possible cut shapes : round, fancy, baguette, melee.