You have a ladie's 10k white gold bar pin with sapphire center stone by Belais. The company was founded in 1863 by David Belais and in 1917 he patented a white gold formula. Your bar pin dates to the 1920's and it sells for $60 - $130 on today's market. Here are links for you to comparables of bar pins, with blue stones by Belais:
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