Turn the rough gem until the glowing facet line meets the grinding
wheel inside the alignment wedge, then hold to polish. A wrong angle
scratches the stone; holding too long grinds straight through it.
Release at the golden moment to finish each facet. Later levels add
more facets at crueler angles. Earn coins and unlock six permanent
workshop upgrades: Precision Coolant, Slow Wheel, Scratch Guard,
Stabilizer Grip, Extra Blank and Lucky Loupe.
Ruby Dawn: rotate, align and polish every ruby facet to perfection.