Lab-Grown Diamond Tennis Necklaces

Yes. Laboratory-grown diamonds are real diamonds, with the same crystal structure, hardness and sparkle as mined stones; only their origin differs. What changes is the price, which is why a lab-grown line can carry far more total carat weight for the same budget.

Around 4 to 6 ct reads as a refined everyday line that suits an open collar. From 7 to 12 ct the diamonds are visibly larger and the necklace is usually worn alone. The 26 1/5 ct Riviera is an evening statement.

Round brilliants give the classic, brightest line. Pear cuts have a softer, petal-like rhythm, the princess-cut line is crisp and continuous, and the emerald-cut line flashes with long step-cut facets.

The diamonds grow larger toward the front of the neck, drawing the eye to the throat. The 6 5/8 ct Graduated necklace is the gentle version; the riviera is the dramatic one.

The diamonds in a tennis necklace are small matched stones set in parcels, so they are not graded one by one. Each product page lists the necklace's total carat weight and specifications.

Most are 16 to 16 1/2 inches, sitting near the base of the neck; the riviera is 20 inches. Each product page lists the exact length.

Most styles come in 14K white, yellow or rose gold; the 6 5/8 ct graduated necklace is made in 14K yellow gold.

Take it off for sleep, the gym and swimming, clean it in warm soapy water with a soft brush, and store it flat. Have the clasp and prongs checked from time to time.

Every necklace ships free and insured by UPS Express with a signature on delivery. Unworn necklaces in original packaging can be returned within 30 days; see shipping and returns. For natural diamond lines too, see all diamond tennis necklaces.