Gyronny of sixteen Or and Argent a Lozenge Azure (differenced by a lozenge gules in the canton) 

Traditionally, a married woman bears her paternal arms marshalled on a shield with those of her husband.  However, the English Kings of Arms have recently ruled that a woman may bear her husband's arms alone on a shield differenced by a small lozenge of a contrasting tincture in the canton, centre chief point or other suitable position depending on the design.

The arms shown here may be used in England.  In Scotland the small red lozenge must be removed. 

Picture by Stephen Clackson