jade refers to an ornamental mineral, often known for its green types, though appears naturally in other colors as well, especially yellow and white. jade can refer to either of two different silicate minerals: nephrite, or jadeite.

Alexandrite is known as "Emerald by day, ruby ​​by night" because it has one of the most dramatic color changes among gemstones, such as green in sunlight and red in incandescent light. The very precious habit of alexandrite color change is caused by the presence of minor impurities in the element chromium. The most desirable Alexandrite colors are those that have a very clear color change.