Diamond has a tetrahdral shape stucture

[Bladibla]

Diamond has a tetrahdral shape stucture, an allotrope of carbon with each carbon covalently bonded to 4 others.

But what happens at the end Carbon of a diamond?

 

[Gokul43201]

This "problem" exists, not only for diamond, but all crystals - the surface structure is different from the bulk structure, and is often very strained.

Notice that by "end carbon", you are referring to the carbon atoms at the surface of single crystal diamond. Surface characterization measurements (notably Auger Spectroscopy) have shown that the diamond surface has a distorted FCC structure - in other words, it's not like the bulk structure, and has wierdness in it.

 

[ravenprp]

At the end carbon of a diamond, the covalent bonds will still be present, but it may not be bonded to four other carbons. This is because diamonds are not always perfect tetrahedrons, and there can be defects or impurities in the crystal structure. In some cases, the end carbon may be bonded to less than four other carbons, creating a vacancy or a dangling bond. This can affect the physical and chemical properties of the diamond, making it less stable or reactive. However, these defects are usually very small and do not significantly impact the overall strength and durability of the diamond.