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Price:$34.99

Planetary Gear Set Necklace | Kinetic Engineering Jewelry, Drivetrain Pendant, Mechanical Fidget, Gift for Engineers, Robotics, Physics

Arrives soon! Get it by Jun 6-11 if you order today
Jun 6-11

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Highlights

Mechanics in Motion. Elegance in Engineering.

Hidden within countless machines, from electric cars to robotic arms, moves a delightful mechanism within engineering: the planetary gear train (also known as epicyclic gearing). Planetary gears are compact, powerful, efficient, and versatile. Their ability to provide high torque in a small space while allowing multiple speed and direction outputs makes them indispensable in modern mechanical engineering. 

Our Planetary Gears Necklace brings mechanical brilliance to life with real working gears that actually spin! Crafted with extreme precision, the pendant features a fully functional miniature gear system, complete with a central “sun” gear and three orbiting “planet” gears, just like real-world planetary gear sets. With a gentle turn the gears engage and rotate smoothly—transforming mechanical motion into wearable art. 

The polished silver steel and gold plated steel pendants measure 1 inch in diameter and are available on a variety of chains and leather cords. Durable and lightweight enough for everyday wear, this necklace is also stylistically versatile enough to span t-shirts to prom dresses and everything in between. As an extra bonus, the pendant doubles as a satisfying kinetic fidget.

Like all of our jewelry, this necklace comes in a hand-stamped gift box along with a little card explaining the meaning of the design. It makes a fantastic, unique gift!

Perfect for:
* Engineers, robotics enthusiasts, physicists
* Teachers, students, makers
* Anyone who finds joy in the way things work!

  • Order today to get by Jun 6-11
  • Returns & exchanges accepted within 30 days
  • Cost to ship: $6.00
    Enjoy free shipping to the US when you spend $35+ at this shop.
  • Ships from: Eugene, OR

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Reviews for this item

Buyer highlights, summarized by AI: Love it · Great quality · Beautiful · Fast shipping · As described · Gift-worthy · Lovely

4.9

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience.

(54 reviews)

4.9 Item quality
4.8 Shipping
4.9 Customer service
98% Buyers recommend
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5 out of 5 stars 5 This item

Etsy buyer May 26, 2026

It’s lovely - just as described and the gears turn satisfyingly smoothly

Etsy buyer May 26, 2026

5 out of 5 stars 5 This item

Akhil May 15, 2026

Awesome gift! Really high quality and looks absolutely amazing

Akhil May 15, 2026

5 out of 5 stars 5 This item

Tiffany May 9, 2026

An incredibly unique piece and so functional! We love the shine on and it feels high quality. We got the longer chain for easier stacking but loved the other products too!

Tiffany May 9, 2026

5 out of 5 stars 5 This item

Brynn May 8, 2026

This pendant is clever, elegant, and exceeded my expectations. I plan to use it as the centerpiece for a science themed charm necklace. So beautiful. Thanks!

Brynn May 8, 2026

Photos from reviews

BoutiqueAcademia
Maile Urbancic
BoutiqueAcademia ·

Eugene, Oregon

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience. 5.0
·
4.4k sales
·
5 years on Etsy
Maile Urbancic
1 shop member
Message seller

Typically responds within a few hours

Typically responds within a few hours

Smooth shipping Has a history of shipping on time with tracking.

Rave reviews Average review rating is 4.8 or higher.

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Listed on Jun 2, 2026
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