Definition of "birthstone" [birthstone]

• A gemstone associated with a particular month and customarily worn by persons born during that month. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "In fact, March and April aren't that exciting either so those could be two weeks, too, except that it greatly shortens the chances that your birthstone will be a diamond."
• "My gaze shifted to Mr. March, who sat at the head of the table with his elbows on the table, his hands clasped together, and I noticed his striking gold pinkie ring with a lapis, which I would find out later was his birthstone."
• "I like jewelry – in fact, one of my most cherished possessions is a tiny birthstone ring my uncle bought for me on my 6th birthday."