The Harmony of Shapes Collection

The shapes: mixed-cut diamond jewelry, pear, marquise and emerald

Look at the mix of cuts first. Round, oval, pear and marquise are brilliant cuts that throw small sparks. The emerald cut is a step cut, with long flat facets that flash in broad planes (general knowledge). The 4 mm bracelet sets emerald, pear, marquise and round side by side.

Pear and marquise stones end in points, and a prong over each tip keeps it from chipping (general knowledge). The thin pear bracelet uses bezels instead, a rim of gold around each stone, so it sits low.

Lab-grown or color: lab-grown diamond and multicolor sapphire bracelets

Nine pieces are lab-grown diamonds in 14K gold, and each says Lab in its name. Grown in a lab or dug from the earth, a diamond is still diamond (general knowledge). The grades they print run F or E-F for color and VS to VVS for clarity: colorless, and usually clean to the eye (general knowledge). They took about seven tenths of the sales here in the year.

For color in 14K, see the two tennis rows. One sets sapphires in five colors. The other mixes sapphires with ruby and pink tourmaline, a softer stone that scratches sooner (general knowledge). Two bracelets describe their stones two ways, so ask us what is set in them.

Width and weight: thin diamond bracelet or wide statement bracelet

Stay at 5 mm or under for a bracelet you never take off. The thinnest is the 1 mm chain of bezel-set pears, about 3 grams. Four bracelets sit at 5 to 5.5 mm, none over 11 grams. From 7.45 mm up the bracelets turn bold. The two 10K gemstone pieces run 9 and 11 mm. Each weighs about 40 grams, the heft of a heavy men's link.

Length and size: bracelet length, ring size and necklace length

Most bracelets here are 7 inches, in one length only. Measure where yours will rest and add about half an inch so the row can move (general knowledge). The two 10K pieces are 8 inches.

The ring runs sizes 5 through 8 in halves, white gold only, and a resized ring can't come back. The necklace is listed at 17 inches. Shoppers have asked us for 20, so ask before you order, since a length we change for you is final.

Gold and the set: white, yellow or rose gold, matching necklace and bracelet

Eleven of the thirteen are 14K. White is offered on all but one listing, yellow on most, rose on about half. The ring and the 4 mm bracelet come in white only, and the Fancy Colors bracelet offers no choice of gold, so ask which it is.

For a set, pair the necklace with the 5.5 mm bracelet. Both carry E-F, VVS-VS lab-grown stones in the same three golds. Try the live chat first, or call or text 212-872-9692 from 10 AM ET. Once we clear it, an unworn, unaltered piece comes back within fourteen days of its arrival, on our insured label, and the refund drops five percent plus that label.