Beryls are popular gems, not only on account of their magnificent colours. Their appeal also lies in their high brilliance and qualities such as their hardness (7.5 to 8), which makes them admirably well suited for use in jewellery.
The emerald is closely related to the aquamarine. This most valuable of all the beryls is given the most beautiful, intense and glowing green imaginable, namely emerald green, by chrome and/or vanadium. Small crystal inclusions, cracks or fissures are not merely tolerated in this precious gemstone; they are actually regarded as features of its identity. Connoisseurs refer to them affectionately as the jardin (garden) of the emerald.