In the 4-8mm range, rubies take center stage in jewelry designs. At this size, rubies make ideal solitaire engagement rings, cocktail and statement pieces. Their brilliance and color saturation really shine. Well-cut rubies over 5mm can display light return nearly equaling diamond. Table and depth percentages are carefully considered for each stone. Vibrant red rubies in this mid-range size command attention. They balance substantial beauty with comfortable wearability. For important adornments, 4-8mm sized rubies strike the perfect chord.