Final Fantasy XV, an open world environment, released for PS4 and Xbox One in Nov last year. It is a battle system similar to the Kingdom Hearts series. To upgrade the engine blade, you need an item known as the glass gemstone. Take on the quest A Better Engine Blade 2 at Hammerhead Outpost to upgrade the engine blade. This glass gemstone Locations guide will show the locations of these gemstones in the game.
Final Fantasy XV Glass Gemstone Locations
Go to the south-west corner of the map to Cape Caem. On your way to the lighthouse, you will find a small building.
Open the door and go in. There will be a well and on top of that well is a glass gemstone.
Go to Lestallum City. Follow the main road and go to the Newfields building on the right side.
Search under the arches on the front porch of the building.
This is in the Altissa. Exit the Royal Suite Lodging. Go left to take the archway.
The gemstone is under the archway near the green door and the staircase.
You can find the complete Final Fantasy XV Guide here.