Origin of the word Carat
The word carat comes from the Carob Mediterranean tree whose seed was used for centuries as the standard of weighing precious gems. Each carob seed weighs approximately one-fifth of a gram. A carat is one-fifth of a gram.
A person or company that makes or sells jewels or jewelry.
A Jeweler may have specialties such as gemology, stonecutting, stonesetting, jewelry design, casting, fabrication, or specific types of repairs. For use with the general public the term "jeweler" is sometimes used as a generalized title rather than the specified title ("jeweler" rather than "gemologist", "jeweler" rather than "stonesetter"). Often, when a Jeweler has a wider set of skills, they are called a Bench Jeweler.
"Jeweler" is the American spelling of the word. As an American company, Walt's Jewelers proudly uses the American spelling.
Sources for these definitions are GIA.edu, Google.com, Meriam-Webster.com, and Wikipedia.org.