Hide Cash in Necklaces (Stash Pendants)
A stash pendant is a necklace with a closed compartment for carrying a folded banknote. To make one, confirm the note’s fold and size, test a full-size cavity mock-up, then choose a smooth, skin-suitable material and secure closure. Check access, retention, and comfort before wearing it, and remove the necklace during sleep, exercise, or activities where it may snag.
The feel of a pendant matters as much as its shape: a smooth, rounded surface can sit comfortably, while a rough seam or sharp edge may catch on a shirt or irritate skin. If you want cash close at hand without a bulky wallet, a stash pendant can be discreet. But it still needs to open reliably and stay closed during ordinary wear.
I approach this as a fit-and-finish problem, not just a matter of making a small box. The note, folds, cavity, closure, chain, and wearer all affect the result. The measurements below are design targets, not regulated jewelry dimensions. Building codes such as IRC, IBC, and NEC do not govern jewelry compartments; material and consumer-product rules may apply instead, depending on the product and where it is sold.
Plan the Pendant and Confirm the Note Fold
Start by choosing the exact note and fold you intend to carry. A U.S. banknote is about 156 × 66 mm, but the folded footprint depends on how you fold it. Measure your actual folded note before setting pendant dimensions; do not assume that a “quarter-fold” always means one standard size.
There is an important measurement detail: folding a note in half twice does not automatically make a 39 × 33 mm packet. That footprint requires folding the 156 mm length into four parts and folding the 66 mm width in half. It uses three folds, producing eight paper layers. Other two-fold patterns produce different footprints.
Make a paper template or fold the actual note, then measure its length, width, and thickness. Use the note you plan to carry, since a crisp note and a worn, soft note may sit differently. If you switch denominations, repeat the fit check even if the bills look similar.
Before designing, decide:
- Who will wear the pendant. This guidance is for adults, not children.
- Whether the pendant will rest against bare skin or over clothing.
- How often you need to reach the note.
- Whether the pendant’s weight and shape suit the chain and clasp.
- Whether the note must come out without tools.
A quarter-folded bill can become creased or jammed if its fit is too tight. Leave room to grasp and remove it, not just enough space to close the lid. Next step: confirm the fold with the real note and keep that sample for later fit checks.
Check Cavity, Closure, and Wear Clearances
A cavity is the hollow space inside the pendant. A useful starting target is 40 × 34 × 2.5 mm inside, with rounded internal corners, for a packet close to 39 × 33 mm. This is a design target only. The actual folded note, closure overlap, wall thickness, and removal space determine whether it works.
Make a full-size mock-up from card or another easy-to-cut material. Check the interior dimensions, then add the planned lid or closure overlap and the outer walls. Try inserting and removing the folded note several times. A compartment that only works when the note is pushed hard is too tight.
| Design check | Starting point | What to confirm |
|---|---|---|
| Folded note footprint | Measure your note | Check the exact fold pattern |
| Interior cavity | 40 × 34 × 2.5 mm target | Test the real packet and removal |
| User-contacting edge radius | At least 0.5 mm recommended | Check for sharp or snagging edges |
| Cavity depth | 2.5 mm target | Confirm closure does not press hard on the note |
| Closure | Positively retained | Confirm it cycles and stays shut |
A positively retained closure is one that has a clear way to stay closed, rather than relying only on loose friction. The design may use a threaded cap, a latch, or another secure method. Each type needs its own fit test. A cap that turns easily when new may loosen with repeated handling; a tight latch may be difficult to open when you need the note.
Also account for finish buildup and wear. A compartment that fits the folded note exactly can jam after finishing or slight deformation. Do not force the lid closed or pry it open with a sharp tool. Next step: keep enough clearance for easy removal, and test the closure with the note inside and outside.
Fabricate, Finish, and Assemble the Pendant
Choose a material with clear information about its composition and suitability for skin contact. Ask the maker or supplier for documentation rather than relying on labels such as “hypoallergenic” alone. A smooth, corrosion-resistant finish and rounded edges help reduce rough contact, but no material is right for every wearer.
For people with metal sensitivities, check what the pendant and chain contain, including coatings and parts that touch the skin. Stop wearing it if you notice irritation and seek advice from a qualified health professional if the reaction persists. Avoid sharp-edged, brittle, corroding, or undocumented materials.
During fabrication:
- Keep seams smooth and remove burrs, which are tiny rough edges left after cutting or drilling.
- Round the edges that may touch skin or clothing. A radius of at least 0.5 mm is a design recommendation, not a legal minimum.
- Make sure the lid or cap cannot pinch the note or leave a sharp gap.
- Check that the chain connector and clasp suit the pendant’s mass.
- Clean the inside so metal dust, polish, or debris cannot mark the note.
ASTM F2923 addresses chemical hazards in children’s jewelry. It does not set adult-jewelry compartment or clasp dimensions, and this guide is not for children’s wear. Rules for consumer products vary by location, so anyone making or selling pendants should check the requirements that apply to their product and market.
Do not choose a very light clasp just because the pendant itself is small. The assembled item includes the chain, connector, and pendant, and its movement can place changing loads on those parts. Use components with manufacturer ratings, then assess the finished assembly as a whole. Next step: finish and clean every surface before testing it against skin or fabric.
Verify Retention, Access, and Wear Safety
Verification means checking that the finished pendant works as intended; it is not the same as formal safety certification. Cycle the closure repeatedly, confirm the note can be inserted and removed without tools, inspect for snags, and check the clasp and connector against their manufacturers’ ratings.
I use a simple order of checks: first with the cavity empty, then with the folded note inside, and finally with the pendant on its intended chain. This makes it easier to spot whether a problem comes from the lid, the note, or the chain connection. A casual hand pull can reveal an obvious weakness, but it does not establish a certified load rating.
Practical fit scenarios: These are design examples, not reports of client installations.
- A tight paper mock-up: The folded note fits, but the edge catches when removed. Increase the usable clearance or revise the opening so fingers can reach the note. Do not solve the problem by forcing the packet past a sharp edge.
- A closure that feels secure when empty: With the note inside, the lid will not close smoothly. Check the cavity depth and overlap. Do not compress the note or force the closure; revise the fit.
- A comfortable pendant that turns on the chain: The cavity works, but the pendant’s shape shifts during wear. Review the chain attachment and how the pendant hangs. Test it over the clothing you expect to wear, without assuming one chain suits every design.
Wear safety matters even when the pendant is well made. Necklaces can snag or become entangled, so remove one during sleep, exercise, and activities where it could catch. Do not wear it if the clasp, connector, or closure has loosened or changed shape. Next step: inspect the pendant regularly and stop using it if any part is damaged.
Conclusion and Next Steps
A useful stash pendant starts with the actual folded note, not a guessed compartment size. Mock up the cavity, allow room for removal, choose documented skin-contact materials, and test the finished closure and chain connection. Treat measurements as design targets, not guarantees; comfort and reliable access depend on the complete pendant.
Before wearing it, confirm that the note comes out without tools, the closure works repeatedly, and no edge catches skin or fabric. If any part feels forced or uncertain, revise the design rather than relying on a stronger pull.
Frequently Asked Questions
These answers cover common fit, material, and wear questions for a cash-carrying necklace. Measurements are starting points only, and a finished pendant needs hands-on checks. No single cavity size or clasp rating applies to every design, note fold, chain, or wearer.
How much cash can a stash pendant hold?
That depends on the cavity. The suggested design target is for one folded U.S. banknote, not a stack. Extra notes can prevent the closure from seating.
What size should the compartment be?
A starting target is 40 × 34 × 2.5 mm inside. Measure the actual folded note and test a mock-up before fabrication.
Does a quarter-folded U.S. bill measure 39 × 33 mm?
Not always. That footprint requires folding the length into four parts and the width in half. Measure your chosen fold rather than relying on the term “quarter-fold.”
What material is best for a pendant worn against skin?
There is no universal best choice. Select a material and finish with documented skin-contact information, and check for ingredients that may concern you.
Can I use a friction-fit lid?
Only if the design retains it reliably through repeated use. Test it with the note inside and inspect it over time; do not assume that a snug feel proves security.
How do I know whether the clasp is strong enough?
Check the manufacturer’s rating for the clasp and connector and consider the assembled pendant. An informal pull test is not a certified load rating.
Can a child wear a cash pendant?
This guide is for adults. Jewelry worn by children raises additional safety concerns; ASTM F2923 addresses chemical hazards in children’s jewelry but does not set adult compartment or clasp dimensions.
When should I take the necklace off?
Remove it during sleep, exercise, or any activity where it may snag or become entangled. Stop wearing it if a clasp, connector, or closure is damaged.
(This article was written by one of our staff writers, Ethan Caldwell. Visit our Meet the Team page.)
