Decide first between the elongated cushion, longer than it is wide, and the classic one nearer a square. The long one lies along her finger. Then pick the setting, since a hidden halo sparkles from the side and keeps the top clean. Most centers here weigh 3 carats or more. Measure her size first, because many rings here are made to order.
Elongated or classic: elongated cushion vs square cushion cut engagement rings
Choose the elongated cushion if she wants the stone to run along her finger. It is longer than it is wide, and it makes the hand look slimmer. The classic sits nearer a square. Both have rounded corners, so no point is left to chip. The Diana is the one old mine cushion, the antique pattern with a small top facet and a tall crown. No listing prints the length against the width, so ask for it. For cut corners, compare radiant cut engagement rings, and for a smooth curve, oval engagement rings.
Setting: hidden halo, solitaire, pave or three stone cushion rings
Take a hidden halo for extra sparkle without a wider top. Some rings here hide small diamonds under the center, seen only from the side. A plain band solitaire shows the cushion alone, and the Compass holds it with a prong at each compass point. The Vivienne sets its center on a double row of pave. The three-stone ring flanks its lab-grown center with two smaller diamonds.
Carat and grades: what carat cushion diamond, its color and clarity
Start at 3 carats; most centers here weigh that or more. A cushion keeps more weight below its top than a round, so it faces up a little smaller at the same carat. A classic cushion of 3 carats is about 8 mm across. Every center that names a color is E or F, both colorless, and every center is VS or better, where flaws rarely show to the eye. Five listings say the center is IGI certified, so ask which report comes with any other.
Lab or natural: lab-grown cushion engagement rings and the natural one
All but one center here is lab-grown, and grown or mined, each is graded on one scale. Lab-grown and natural diamonds of the same grade look the same; a natural diamond costs more. We don't sell diamonds as an investment, and resale value isn't guaranteed for either. The natural ring sets a 2.02 carat cushion over a band of natural diamonds all the way round. It comes in size 6.5 only, and a band set all round rarely resizes.
Size and gold: her ring size, 14K or 18K, and how long it takes
Measure a ring she wears on that finger against the ring size chart. Nearly every ring here runs 5 to 8 in half sizes, and most reach 4 to 9. For a ring worn day in, day out, take 14K. The two 18K rings are softer and mark sooner, and their yellow runs deeper. White and yellow gold are offered on all of them, rose on most. Many rings here are made to order in her size; each listing shows its weeks. A ring made to her size, or resized later, is final under the refund policy. Ask the live chat which rings are ready now, or call or text 212-872-9692 from 10 AM ET.