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A green expression
of andradite.
Demantoid belongs to the garnet family and is the green variety of andradite. GIA’s Gübelin Gem Project includes demantoid specimens with published observations and data.
Explore the GIA reference data ↗Color. Brilliance.
Fire.
These describe different aspects of what you see. Color is the body appearance of a stone. Brilliance concerns the return of light. Fire refers to flashes of spectral color.
Cut, orientation, lighting and the individual crystal affect the viewing experience. Compare a stone in diffuse light and a smaller direct light source, and ask how its photographs were made.
A useful starting point.
Identity
What does an independent report identify?
Treatment
What is disclosed, and what has actually been tested?
Dimensions
Are weight and measurements recorded for this exact stone?
Origin
Is the statement a supplier attribution or an independent opinion?