The effect caused by small inclusions of minerals like mica, hematite, pyrite, or goethite which cause a gemstone to exhibit a glistening or sparkling effect when rotated or moved. The name is derived from aventurine, a green variety of quartz. (Pronounced: ah-ven-shur-ess-ense)

Aventurescent gems are those that have a colourful play of glittering reflections from small metallic inclusions. This phenomenon is commonly found in Sunstone, Aventurine Quartz and Gold Stone.

It is the effect being caused by small inclusions of a mineral having a highly reflective surface that causes it to exhibit a glostening effect when rotated or looked at different points. The common examples are Hematite, Pyrite, or Goethite. The name has been derived from Aventurine, which is the green variety of Quartz that exhibits this effect. The effect is also called as aventurization.