<page_title> Diamond simulant </page_title> <section_title> Summary table </section_title> <table> <cell> White sapphire <col_header> Material </col_header> <col_header> Diamond </col_header> <col_header> Artificial simulants: </col_header> <col_header> Flint glass </col_header> </cell> <cell> 1.762–1.770 <col_header> Refractive index(es) 589.3 nm </col_header> <col_header> Artificial simulants: </col_header> <row_header> White sapphire </row_header> </cell> <cell> 9 <col_header> Hardness (Mohs' scale) </col_header> <col_header> Artificial simulants: </col_header> <row_header> White sapphire </row_header> </cell> <cell> Spinel <col_header> Material </col_header> <col_header> Diamond </col_header> <col_header> Artificial simulants: </col_header> <col_header> Flint glass </col_header> <col_header> White sapphire </col_header> </cell> <cell> 1.727 <col_header> Refractive index(es) 589.3 nm </col_header> <col_header> Artificial simulants: </col_header> <row_header> Spinel </row_header> </cell> <cell> 8 <col_header> Hardness (Mohs' scale) </col_header> <col_header> Artificial simulants: </col_header> <row_header> Spinel </row_header> </cell> </table>
The sapphire and spinel has a hardness of 9 and 8 and RI of 1.762–1.770 for sapphire, 1.727 for spinel.