MARTINEZ — It was a $1.7 million heist pulled off with blazing speed, where dozens of men burst into a San Ramon jewelry store in broad daylight, swinging hammers, filling their bags, and firing shots before fleeing to getaway cars in a meticulously planned operation.
But five months after Heller Jewelers was hit, prosecutors in Contra Costa seem to be catching up. On Wednesday, a jury convicted two men of 14 felonies for their roles in the plot, and authorities recently secured indictments against 15 other suspects.
The defendants, Ira Austin, 19, and Jimmy Ray, 27, were convicted of conspiracy and 13 counts of robbery. Ray’s brother, Michael Ray, already pleaded no contest to being the getaway driver in exchange for a three-year prison term, and a juvenile, who prosecutors say was armed with a gun at the time, is being prosecuted separately, authorities say…