Alexandrite pendant necklaces are a captivating and unique type of jewelry that showcase the rare and mesmerizing color-changing abilities of the alexandrite gemstone. This phenomenon, known as the "alexandrite effect," involves the stone appearing green or bluish-green in daylight or fluorescent light and changing to red or purplish-red under incandescent light. This creates a stunning visual effect, earning alexandrite the nickname "emerald by day, ruby by night". Natural alexandrite is extremely rare, making it highly valuable. Lab-created alexandrite offers a more affordable alternative while still possessing the same unique color-changing effect. Whether natural or lab-created, an alexandrite pendant necklace is sure to be a conversation starter and a treasured piece for years to come.