The halo setting has become hugely popular for engagement rings, but it also works nicely to show off stones other than diamonds. Here, Lunessa offers an aquamarine, interestingly set in yellow gold. As aquamarines are cooler stones, they can look icier in white metals. (The ring is available in your choice of white, yellow or rose gold.)

It sells for USD$1,500. The designer notes, “Sparkling and fancy, this gorgeous fancy Cushion-cut Aquamarine Gem is flanked with a halo of shimmering brilliant cut Diamonds and set in stunning 14K Gold. Aquamarine gem measures approx. 7.5 mm x 6.5 mm, and is believed to be an offering of Peace and Love from the mermaids themselves. Handcrafted with Love in NYC. Please allow 2-3 weeks; this item is handmade to order.”