The easiest way to easily identify this gemstone is by its color.
The natural grandidierite gemstones are exclusively available in blue and green tones. Soft neon blue is the most sought-after color since it is both extremely rare and expensive.
Another reliable way to identify Grandidierite is by seeing it from various angles. Due to the pleochroic characteristics, this stone might appear in at least two or three colors depending on which side you look at. There are extremely few places where this phenomenon happens.