Are the stones real diamonds?

No. Both necklaces use CZ stones. The GLD listings describe them as AAAA-AAAAA hand-set CZ, not natural or lab-grown diamonds.

Which is better for everyday wear?

The 5mm White Gold Tennis Necklace. Its slimmer 5mm profile and adjustable 12-15 inch length suit daily wear better than the 7mm statement piece.

Which looks bigger on the neck?

The Cushion Cut Tennis Necklace. At 7mm wide it is noticeably bolder than the 5mm round-cut necklace.

Is the Cushion Cut necklace solid gold?

No. It is 14k white gold plated, while the 5mm necklace is solid 18k white gold. That is the main material difference between them.

The 5mm necklace should hold up better because it is solid 18k white gold. Plated jewelry can wear through over time. Both carry GLD's lifetime repair guarantee for craftsmanship defects.

Which is worth the extra cost?

Compare current store prices first. If the 5mm necklace costs more, the solid 18k gold and adjustable length justify it. Pick the Cushion Cut only if you want the wider statement look.

Diamond Tennis Necklace in White Gold- 5mm vs Diamond Cushion Cut Tennis Necklace

Buy the 5mm White Gold Tennis Necklace if you want a classic, versatile look in a solid 18k white gold setting with a longer adjustable range. Buy the Cushion Cut Tennis Necklace if you want a bolder 7mm statement piece with cushion-cut stones and a fixed 17-inch length. Both are GLD pieces with a lifetime repair guarantee, and both use CZ stones rather than natural diamonds despite the diamond-heavy naming. Check current prices at each store before deciding, since neither listing price is confirmed here.

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