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Is it diamond or moissanite?

For a long time moissanite have given headaches to jewellers. Because its thermal conductivity is close to diamond it gives positive response to diamond thermal probe. Specially when it is in setting it is difficult to get its specific gravity. It was so easy to be mistaken for diamond. But now,  with a little careful inspection you don't even need the moissanite tester to understand the differences.

 

 Diamond 

The tiny lines at the girdle of this diamond are called "bearding" which is typical to diamond. The unfaceted girdle of diamond has granular texture.

Again very typical of diamond; a natural at the girdle and behind it there are the garnet inclusion.

 

A crystal inclusion in diamond.

The steplike fracture in diamond.

  

The "trigons" of a rough diamond.

A  fracture in diamondwhich is called ‘feather’ . 

Dark inclusions in a diamond.

  

Moissanite 

Moissanite has continious polish lines at the girdle which look like thin groves 

These tube inclusions are typical inclusions in moissanite. 

Hair like tube inclusions in moissanite 

 

 

Concoidal fracture in moissanite. It resembles a shell. 

The double lines of the girdle  reflecting from the table in moissanite. 

The double lines of the tube inclusions in moissanite.

The surface colour of this stone is very dark grayish green although the inside looks very pretty green. It is mistaken very easily as a black diamond because it reacts positively to thermal diamond probe. But the double lines of the inclusions and facet lines and a specific gravity of 3.23 gives us the proof that it is synthetic moissanite.