Steven Khalil jewellery uses diamond simulant stones. Steven Khalil diamond simulant stones are indistinguishable from a natural diamond with the naked eye. They are cut by master craftsmen to the exact proportions and standards demanded by the diamond industry to ensure each stone has maximum brilliance. Steven Khalil diamond simulant stones are grown in a state of the art laboratory from the natural mineral base zirconium oxide and this revolutionary stone is produced using intense heat. As a result, Steven Khalil diamond simulant have a hardness of 8.5 with a diamond measuring 10 on the industry standard MOHS scale.