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Related to birthstone: horoscope
A gemstone associated with a particular month and customarily worn by persons born during that month.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Astrology) a precious or semiprecious stone associated with a month or sign of the zodiac and thought to bring luck if worn by a person born in that month or under that sign
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a precious or semiprecious stone traditionally associated with the month of one's birth.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.