Emerald Cut Lab-Grown Diamond Necklaces

A solitaire pendant lets the step facets speak on their own, held at the corners by claw prongs. Halo pendants add a frame of pavé that softens the rectangle and makes a modest weight read larger. The three-stone bar lays emerald cuts side by side for a longer, more architectural line.

That number is a sum across every stone in the piece. A halo spends some of it on the frame, which leaves its middle stone a touch lighter than a solitaire's at an equal number. For an emerald cut pendant meant for daily wear, 1 to 2 carats total weight reads crisp without feeling heavy.

• White gold: keeps the stone looking icy and bright.
• Yellow gold: adds warmth around the corners of the rectangle.
• Rose gold: blush metal that flatters warm complexions.
• Silver: offered as Silvadium, a sterling silver made to resist tarnish.

Step cuts show grease and lotion faster than brilliant cuts, since their broad facets act like small windows. Soak the pendant in warm water with mild soap, sweep a fine toothbrush under the setting, and rinse. Fasten the clasp before perfume and hair spray, and store the necklace flat so the chain doesn't kink.