How Can You Tell if a Diamond Tennis Necklace Is Real?
Wondering how to tell if a diamond tennis necklace is real? When you're shopping for a necklace that sparkles and shines, you want to make sure it's the real deal. The easiest way to spot a real one? Look at the shine. A real diamond gives off bright white light — not rainbow colors. The metal matters too. Real tennis necklaces are set in strong, high-end gold or platinum.
At BNB Luxury, we make it simple. All our tennis necklaces — like the Emerald Cut Tennis Necklace or the 40-Carat Tennis Necklace — come with official paperwork and appraisals. That means they’re 100% real and verified.
Look for the Shine and Quality
A real diamond tennis necklace has serious sparkle. If the stones flash mostly white light and shine from every angle, that’s a good sign. If it looks too rainbow-like or dull, that’s a red flag.
Check the setting too. Real diamonds are usually set in high-quality metals like 14K or 18K gold or platinum. Look for stamps like “14K,” “18K,” or “PT” on the clasp or back.
Real diamonds also have small natural marks or lines inside the stones. If everything looks too perfect, it might be fake or lab-made.
Simple At-Home Tests
Here are some easy tests you can try at home:
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Fog Test: Breathe on the diamond like you’re fogging up a mirror. A real diamond clears up fast — like in a second. A fake one stays foggy longer.
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Water Test: Drop the necklace in a glass of water. A real diamond will sink because it’s heavy. If it floats or stays near the top, it’s not real.
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UV Light Test: Shine a blacklight (UV light) on the stones. Many real diamonds glow blue. But not all diamonds do this, so don’t use this test alone.
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Diamond Tester: A jeweler can use a small device to check if a diamond is real. These tools measure how heat or electricity moves through the stone. Real diamonds react differently than fakes.
These tests help, but for expensive jewelry, it’s best to get a pro to check it.
Get a Certificate or Appraisal
If you're buying a diamond tennis necklace, ask for a certificate. This is a report from a trusted gem lab like GIA, AGS, or IGI. It tells you everything about the diamonds — size, color, clarity, and cut. This report should match the diamond exactly.
Already have a necklace? Bring it to a certified appraiser. They’ll look at it closely and tell you if it’s real. At BNB Luxury, all our necklaces come with a full appraisal. For example:
Each one is checked and confirmed by a trusted expert.
BNB Luxury is based in the NYC Diamond District and serves clients around the world. We stand behind every piece we sell. When you buy from us, you know it’s real.
Want to learn more about matching pieces? Check out our blog on diamond tennis bracelets.
Shop Real Diamond Tennis Necklaces
Looking for the perfect tennis necklace? Take a look at our full Tennis Necklace Collection. From bold 40-carat pieces to sleek 8-carat styles, we have stunning options for every taste.
Want help choosing the right one? Book a private appointment with one of our jewelry experts in NYC. We’ll guide you every step of the way.