Pendant Bail Size Guide

A bail is the connector between a pendant and a chain. It comes in a few styles:

• Fixed loop bail: a ring soldered to the top of the pendant. Simple and strong.
• Tube or barrel bail: a short tube the chain runs through. Common on heavy pieces.
• Hinged or snap bail: opens and closes, so the pendant can go on a chain without passing over the clasp.
• Hidden bail: sits behind the pendant so the chain seems to disappear into it.
• Jump ring: a small round ring joining the pendant to a fixed loop. The weakest point on many cheap pendants.

You need two numbers from the bail: the inside width and the inside height.

1. Lay the pendant flat on a table.
2. Use calipers, or a ruler in millimeters, to measure the inside of the opening from side to side and top to bottom.
3. Write down the smaller of the two numbers. That is the limit.

Then measure the chain width (the mm number on the listing) and the clasp, at its thickest point. A lobster clasp is usually much thicker than the chain itself.

The bail opening should be at least a little wider than the chain, so the pendant can move freely and hang straight. A tight bail rubs on the links and wears both.

Chain	Width	Minimum bail opening	Good for
Box Chain 0.8mm ($315)	0.8 mm	about 1.5 mm	Small charms, initials
Box Chain 1mm ($470)	1 mm	about 2 mm	Everyday pendants
Cable Chain 2mm ($955)	2 mm	about 3 mm	Medium pendants
Rope Chain 3mm ($2,175)	3 mm	about 4 mm	Religious pieces, medallions
Flat Miami Cuban Chain 5mm ($1,880)	5 mm	about 6 mm or more	Large pendants
Hollow Cuban Chain 8.5mm ($4,870)	8.5 mm	about 10 mm or more	Statement pieces

Those minimums are a working rule of thumb used at the bench, not a formula. Thick chains are also tall: a Cuban or rope chain is thicker front to back than a flat chain of the same width, so check both directions.

If the bail is only slightly bigger than the chain, the pendant has to go on before the clasp is attached, or it has to be threaded on from the end opposite the clasp. Most lobster clasps on a 1 mm chain are around 9 to 12 mm long and 3 to 5 mm thick, so a small bail will not clear them.

• If you plan to switch pendants often, choose a large bail or a hinged bail.
• If the pendant stays on one chain, a snug bail is fine and looks cleaner.
• Heavy chains often use box clasps, which are flatter and wider. Measure them too. See lobster vs box clasps.

The bail also decides how a pendant hangs. A heavy diamond piece on a thin chain will flip, pull the chain into a V and wear the links fast. Large natural diamond pieces like the Mixed Natural Diamond Pendant, 10K Two-Tone Gold ($9,500) or the Mixed Natural Diamond Pendant, 10K White Gold ($5,900) need a chain with real strength. A light charm such as the Gold Initial Necklace ($365) or the Gold Cross Pendant ($430) sits better on a fine chain where the bail can move freely.

For chain length and how the pendant drops on your chest, see the men's chain length guide. Total stone weight on iced pieces is explained in total carat weight.

Large iced pieces put a lot of weight through one small loop. On a heavy pendant, look for a thick, solid bail, often a tube style, soldered directly to the frame, not hung from a thin jump ring. Check where the bail meets the pendant for cracks every few months. Pair a heavy piece with a chain that has the strength to match it; a thin box chain under a big pendant is the most common break we see described by buyers.

A bail that is too small is not the end. A bench jeweler has a few options:

• Add a larger jump ring or an enhancer bail above the existing loop.
• Replace a soldered bail with a bigger one in matching gold.
• Fit a hinged bail so the pendant clips onto any chain.

On a custom piece, the bail is part of the design from the start. In our custom process, the design and the exact price are set before anything is made, so that is the moment to name the chain you will wear it on.

1. Note your chain width in mm and its style.
2. Measure your clasp at the thickest point.
3. Ask for, or measure, the inside bail opening.
4. Bail bigger than the clasp: slides on and off freely.
5. Bail bigger than the chain but smaller than the clasp: fits, but stays on that chain.
6. Bail smaller than the chain: needs a new bail or a thinner chain.

Shop pendants, diamond pendants and iced out pendants, and see the jewelry glossary for bail, jump ring and the rest of the terms.