Redstone's rhymes with:
headstones, gladstones, headstones, madstones, blackstone's, bridgestone's, cherrystones, cobblestones, cornerstones, firestone's, flagstones, folkstone's, gallstones, gemstones, gladstones, gravestones, hailstones, headstones, keystone's, keystones, limestones, livingstone's, madstones, milestones, moonstones, rhinestones, tombstones, waterstone's, yellowstone's
Redstone's sounds like:
ratcheting, readjusting, redacting, reductions, retesting