Michael Hall jewellery cleaner is biologically active and is the most effective gemstone cleaner available.
Method of use: mix about half a teaspoonful of the concentrate with a small cup of warm (not hot)water. Immerse the jewellery in it and leave in a warm place overnight. In the morning, rinse well under the tap and your diamonds will sparkle like new.
A 120ml. bottle of the cleaner concentrate costs £7.50 (+£2.50 p&p if ordering by post).
N.B. Not to be used on organic materials such as pearls, coral and cameos.