A. Jaffe, ajaffe.com

If you’re looking for something timeless but aren’t a round-diamond kind of girl, try on an emerald cut, like this one from Ritani for Forevermark (forevermark.com).

Tiffany, tiffany.com

Kwiat, kwiat.com

Cartier, cartier.com

De Beers, debeers.com.

Fred Leighton, 212-288-1872

Harry Winston, harrywinston.com

McTeigue & McClelland, mc2jewels.com

Royal Asscher, royalasscher.com

Intricate scrollwork adds antique appeal to Cathy Waterman’s “Leafside” marquise (barneys.com).

A simple band puts the focus on De Beers’s pretty pear (debeers.com).

A basic bezel setting gives Tiffany’s sweet heart a little edge (tiffany.com).

Set horizontally (also referred to as east-west), Stephen Russell’s narrow oval stunner (left, top) mimics a pricier marquise (212-570-6900). Micropave pumps up the pear in Katharine James’s “Bella’s Love” (katharinejames.com, left, bottom).

Many emerald cuts are narrow; others, like this one by Chad Allison, are magnificently wide (chadallison.com).

Thanks to a ring of pave, Martin Katz’s Asscher takes on a new shape all its own (martinkatz.com).

For a twist, choose a horizontally set emerald cut, like MaeVona’s “Eorsa” (maevona.com).

Though Christopher Designs’s Goliath creates the illusion of one giant stone, it’s actually a Crisscut emerald and two trapezoids (christopherdesigns.com).

Kwiat’s notice-me princess shines alone (kwiat.com).

Michael M’s princess has two rows of pave (michaelmcollection.com).

Round diamonds soften Kirk Kara’s “Carmella Collection” emerald cut (kirkkara.com).

Le Vian’s oval-cut pink diamond (far left) is flanked by half-moon white ones (877-253-8426). Love green? Feast your eyes on H. Stern’s oval-cut emerald (hstern.net, near left).

Daria de Koning’s cushion-cut yellow sapphire has the look of a canary diamond -- for less (dariadekoning.com).

Be like Kate Middleton and rock a sapphire, such as this emerald cut from OGI (ogi-ltd.com).

Or go bold with Anna Sheffield Bridal & Commitment Jewelry’s oval ruby (bridal.annasheffield.com).