Chemical exposure in normal household settings (chlorine bleach, lemon juice, ammonia), diamond on sapphire, sapphire on sapphire etc. Just chlorine exposure ov

Chemical exposure in normal household settings (chlorine bleach, lemon juice, ammonia), diamond on sapphire, sapphire on sapphire etc. Just chlorine exposure over time (swimming, doing household cleaning) can actually weaken sapphire to the point of disintegrating. Remember, precious and semi-precious stones are just fancy chemical compounds.