Natural Zambian Emerald Loose Gemstone. Emerald weight till 16 ct. Emerald shape/cut Octagon. Buy a natural octagon cut quality AA, weight 12.90 carats total. Emerald available to order, worldwide delivery. This gem is certified and its photos, video and lab certificate are available on our gems online store. The value of the stone is good considering its properties and effects. Gemstone suitable for an emerald ring or an emerald pendant .