FOOD ESSENTIAL candy sugar (or sweet diamonds as it is popularly called) is a sparking-white big crystal sugar obtained by cooling supersaturated sugar solutions. Its large crystals boast of purity and are also very attractive. candy sugar is a great sweetener for tea or coffee and sits pretty on a table setting. It is also popular among makers of homemade fruit liqueurs. Loved by both kids & grown ups this rock candy makes a substitute for dessert after meals.