gemstone

John Dory (edible marine fish) / any of a group of other fish. See French Wikipedia for more details

slingshot

stumbling block

(architecture) cornerstone / (figuratively) cornerstone

(architecture) foundation stone

1 Peter

2 Peter

pumice (light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas bubbles, which are frozen into the rock as the lava solidifies)

(of a building, literary) to destroy completely