Beryl and chalcedony share something very important. Both are not very precious gemstones (though beryl is more precious), neither they are very well known but some very important gems are varieties of them.
Aquamarine, emerald and morganite are all varieties of beryl with same Mohs hardness.
Beryl exists in several colors with white (colorless) and yellow being the most predominant colors. White beryl is also called goshenite and yellow colored one called heliodor.