3 Carat Emerald Cocktail Ring in 18k Yellow Gold3 Carat Emerald Cocktail Ring in 18k Yellow Gold. This custom made emerald cut solitaire is set with a 3. 45 carat emerald in 14 karat yellow gold. This repurposed emerald is truly exceptional, featuring a rich blue green hue with high transparency. Set in a simple solitaire in a four (4) prong basket this emerald cut square emerald is beautifully complemented by the high polish yellow gold custom made setting.