[SauronOfMordor]

If they get the process's cost down low enough, and can produce large diamonds in pre-determined shapes, diamond parts could replace steel parts in certain applications requiring high-hardness.

Imagine having a diamond chef's knife whose edge was atomicly-sharp, and would never need honing

[Centurion2000]

Imagine having a diamond chef's knife whose edge was atomicly-sharp, and would never need honing

Actually there is a company out there that is generating vapor deposition diamond coatings. One of the things they described was similar to what you were looking for.

[Moonman62]

Imagine having a diamond chef's knife whose edge was atomicly-sharp, and would never need honing.

Whose finger is in my salad?

[FierceDraka]

Imagine having a diamond chef's knife whose edge was atomicly-sharp, and would never need honing.

Or maybe a razor you can shave with for a year. Personally, I see no end to the potential practical applications of these technologies. Eyeglasses, lightweight armor-piercing ammunition, scratch-proof optical storage media, etc.

[HiTech RedNeck]

Imagine having a diamond chef's knife whose edge was atomicly-sharp, and would never need honing

But what would you need to use for a cutting board? Another diamond surface?