A diamond enhancement process whereby a cavity in a diamond is filled with an artificial substance.

Fracture filling conceals cracks in diamonds by filling them with a foreign substance. The filling may not be permanent.

In diamonds, fracture filling entails a molten glass filling that improves clarity. You can get a lot more stone for your money buying fracture-filled diamonds; the problem is that the treatment isn't always permanent. Get all enhancements clearly stated on your bill of sale.