Best Jewelry Sizers & Mandrels of 2025

“I'm so glad I can know the exact ring size when ordering jewelry instead of guessing. This tool is easy to use and has been accurate every time.”

“When I needed a ring sizing tool quickly, I ordered this and received it the next day. I told my daughter about a ring I wanted for Christmas, but I had no idea what size to get after losing weight. This inexpensive tool provided all the information I needed without a trip to a jewelry store!”

“Having this ring sizing kit at home has been a great help for my husband and me, especially since we've both lost weight this year. It's so handy to be able to easily size our now slimmer hands!”

"As a jewelry enthusiast, I found the Ring Sizer Measuring Tool to be a game-changer. The variety of sizes, from 1 to 17, is incredibly versatile, eliminating the guesswork when shopping online or creating custom pieces. Its durability is impressive; it feels sturdy even after repeated use. Plus, being eco-friendly and reusable is a bonus. The clear markings make it easy to use, and my friends were equally impressed!"

"I bought the REIDEA Ring Sizer to get my exact ring size for a custom piece, and it worked perfectly! The gold scale markings are clear, and the included magnifying glass helped me ensure accuracy when sharing my measurements with the jeweler. Knowing my size in advance saved me from errors and ensured a perfect fit!"

"This tool is a must-have for anyone who dreads returns. It's affordable, compact, and easy to use. With this, I won't have to worry about ordering the wrong size ever again!"

"I purchased these because my engagement ring was too big. The pack comes with 2 sizes and lots of them! I found it easy to put on and very comfortable. I don’t even notice it’s on the ring, and it doesn’t cut into my finger at all. I highly recommend purchasing these."

"After losing weight, my engagement ring and other rings no longer fit. These spacers work perfectly for me. I’m very pleased with the quality of this item, and I love that it comes in multiple thicknesses. They are easy to use and very durable—no issues so far!"

"I used this sizer helper on a ring that belonged to my grandmother. I didn’t want to have it resized at a store, so I gave this a try. It’s easy to use and works great. I take my rings off for washing and showering, and it keeps my ring in place and on my finger!"

"I am thrilled with this set! I got so much value for the price I paid, and even though the writing on the ring sizers is a bit faint, the overall quality is impressive. Two mandrels included is just fantastic. The plastic mandrel is easy to read, and the hammer works perfectly. This kit has everything I need for ring making and more. I highly recommend it!"

"I chose this set specifically for the mandrel that could also size rings. I was blown away by how easy it was to reshape my misshapen rings—just sliding them down the tapered mandrel did the trick! I fixed six rings quickly, including one with sentimental value. The ring sizers are super helpful for online shopping, and the jewelry cleaners worked wonders on my silver rings. I couldn't be happier!"

"I bought this set to enlarge my sterling silver engagement ring. I appreciated the assorted components, but I found the hammer/mallet to be decent while the wooden dowel was a bit soft for my needs. The plastic rings sizer felt inaccurate, which was disappointing. If I were to purchase another set, I would seek out something of higher quality."

"This was exactly what I needed! I love that it comes with its own plastic storage box for my jewelry. I can easily cut each piece into smaller segments for multiple rings—about 10 from each piece! The item matched the description and arrived quickly. Easy to use and a great deal!"

"As I've aged, my fingers have gotten smaller, and this product works perfectly to keep my wedding ring from slipping off. However, sometimes the rings twist on my finger, and the raw ends of the adjustor can poke me a bit. I plan to use these occasionally, but not all the time."

"I was thrilled when my pack of ring adjusters arrived quickly and securely packed. Within minutes, I was applying them to my engagement ring and a signet ring that I couldn't wear anymore. Easy to put on and now my rings are secure without the need for resizing, which would have lost the hallmarks. Comfortable and clever solution!"

"I purchased this set to help me determine my ring size before my wedding. I was thrilled to find it easy to use and accurate. The Mandrel Measurement Tool eliminated any guesswork, and I discovered my ring finger size is 4.5, which fits better than the usual 5 I wear. It's a strong aluminum gauge that I believe will last for years. I'm very satisfied with my purchase and highly recommend it."

"For anyone looking to size rings or fingers, this set is a fantastic deal at $12.99 + tax. I've already used it a couple of times since I received it. It's truly everything one needs for accurate sizing!"

"I gave a set to a friend who owns a local consignment shop, and she absolutely loved it! The design is so well thought out that I believe it will last forever. It's incredibly easy to use!"

"I wanted to buy my parents health rings, but since they don't wear rings, I had to get their sizes first."

"This gadget is easy to use and works perfectly for measuring finger size, although I wish it included 1/4 sizing options."

"I love ordering silver rings online. This little tool makes it so much more convenient and is a great price."

"I found the Splenor Tools Solid Stainless Steel 4 Size Ring Mandrel to be so well crafted that it resembles a piece of art. It's both smooth and precise."

"This tool is heavy and well constructed, giving me confidence in its accuracy."

"As someone who enjoys metal detecting, I often find bent rings. Thanks to this mandrel, I now have a dedicated tool to reshape them, eliminating my previous makeshift attempts. It's steel, not aluminum or plastic, so I never worry about damaging it. The storage case is a thoughtful addition too!"

"When I first saw the mandrel, I was impressed by its nice finish and heavy weight. It has the sizes engraved into the steel, so there's no worry about them wearing away. I highly recommend this for anyone into jewelry making!"

"I didn't know what to expect when I ordered this mandrel. Upon opening the box, I was pleasantly surprised by its substantial build. Just a heads up, it comes coated in a thin layer of oil for protection, which I didn’t anticipate. Overall, it has proven to be a great tool for sizing rings!"

"This mandrel is solid, heavy, and the size markings are easy to read. I found it perfect for sizing rings accurately. However, I did notice it had a bit of dirt and an unpleasant smell upon arrival, but a quick wash took care of that. Very happy with my purchase!"

"I found this product to be great. The solid material helped me resize my ring perfectly."

"As someone who is not a jeweler, I was pleased with how easy it was to fix warped rings. The tools included are simple yet effective."

"My wife is thrilled with it! It's straightforward and easy to use, making it perfect for ring crafting."