American Art Deco rare “Colombia Emerald” solitaire ring set with a gem quality, rectangular step-cut natural emerald of 4.72 carats (Colombian origin, natural, minor oil clarity enhancement, Certificate) set in an iridium platinum mounting and further set with two diamond-shaped diamonds (approx. .40 of a carat TW), four baguette diamonds (approx. .10 of a carat TW) and four round-cut diamonds (approx. .15 of a carat TW), marked: 10% iridium platinum, c.1930