Adjective modifier

• green: Distinction is based on the unique inclusions and the chemical features of the Nigerian emeralds and green beryls.

• synthetic: The standard gemmological properties correspond to the known range for synthetic beryls of Russian production.

• blue: Crystals: soft blue crystals, such as blue lace agate, blue beryl or azurite.

Modifies a noun

• crystal: Left: A single pale blue beryl crystal 5 mm long with darker blue ghosts near its center.