The bead above is. Well, it looks like it is. Until the finished article arrives and the proportions seem a bit off, the opening is obviously too small for your cord, or 40 of them prove too much weight on your piece. That gap between the photo and the finished article is what a Glass Bead size chart is really made for, and one millimeter figure alone is rarely enough to really fill it.
Here's a condensed version. You must obtain several more measurements before purchasing. Outside diameter, inside diameter, form or location, and uniform weight over the entire pattern (these four are not interconnected or tracked together) - all four are separate measurements. Two beads can claim they are the same mm and still serve an entirely different purpose. You will get what you pay for, and a little time and reading of four measurements can help you achieve the product you visualized.
None of this is hard at all, it just gets lost in the glorious shot, money seems good value (again, guilty). Read a little bit and you'll never waste as much time restretching.
If you just want to browse what we have at the moment (this will happen if you're just here for looking), you may browse current glass beads and their individual statistics for each entry. However, for the decision-making, keep on reading.
Part 1: The 4 Things to Check Before You Trust a Millimeter Number
Approximately 30 sec to read each new listing. It's always worth doing. Read all four. Then... make up your own mind.
- Outside size. The set of the bead to the strand. It influences the visual size and how your piece will be perceived from arm's length.
- Center opening. What fits in the center channel? If it can't take your cord, wire or head pin (the one that refuses to fit will freeze your project dead in its tracks) then it's not going to be used!
- Shape & direction. A round sit effortlessly. A shape that is teardrop shaped, faceted or directional will not only lie but also catch the light according to its position.
- Project weight time and time again. So light holding one bead in your hand is easy, but 40 so much! The total weight determines whether a design hangs or sinks.
Outside Size, Center Opening, and Orientation Are Three Different Readings
Here's where most of the trouble happens. outside size and center opening are measured separately. always has been. Beads can be oversized on the outside, but have tiny opening (or the other way round). opening size is something to read on its own again. Both can be same size on outside, but different on inside. Therefore, you can't read one by the other.
Orientation! Third, but one of the most critical pieces and often overlooked! A bead sitting forward facing in the image may turn to the side or twist around to the back when hanging in a string (I have been the new buyer on the other side of the table more than I care to remember—this is a frequent problem!). When viewed forward facing, to the side, or at a 45 degree angle, it makes all the difference in the line of a piece.
A quick word of caution—it is possible to find a glass beads size chart that will describe these using several synonyms. outer dimension, Outside Size, overall size-same difference. center opening, Center Hole, the hole, the opening-either way, all the same really. The thing to remember is that the outside measurement and the opening measurement are to be read as two separate readings, not one measurement with two names. Different names, same 2 readings.
If you want a scale reference for all sizes and hole ranges in general- not just for glass- but as a decent place for comparison to help you get your bearings, ZoeDIY has a general bead size and hole guide on the Shop by Size page. Use it to know on average how the mm's and holes compare in general- just don't rely on it as the single standard hole number for all glass beads because there simply isn't such a thing.
Sizing for the Project, Not for a Single Number
Different Projects, Same bead: Different problems… Comparing your readings from a Glass bead Size Chart to your actual layout can never be as good as memorizing it… maybe it can be, so in case you haven't memorized it, here is a little decision matrix - conditions, testing needed, notes, common traps.
| Planned layout | What to check | Why it matters | Common risk |
|---|---|---|---|
| Easy repeated shape | Repeated total weight, uniform outside dimension | The number of small beads adds up all the way, while the whole necklace remains comfortable over the entire length | Underestimating the total weight when there were more than 40 beads |
| Bracelet-style repeated configuration | Center opening, cord/elastic allowance, outside dimension | The opening has to be large enough for your stringing material, with extra space (clearance) | The hole appears perfect on a single bead but gets snagged when strung tight |
| Larger focal or directional element | Orientation, hardware clearance, outer dimension | A focal element determines the visual scale and has to hang at the correct distance and clearance | Assuming it points forward when it turns out to one side |
Yes, these are decisions, not absolutes. Some fraction that would look amazing in one situation might totally jar on another (that 10mm bead holding the center piece would be the 'oh my God, that looks enormous' bead on a fine thread, and just the right size on a large-scale layout), and a chart isn't necessarily going to be able to tell you if it will work or not. That's not a failure of the chart - it's how practical projects grow. Consider the matrix more an inspiration to reason out your decisions.
Another point worth to mention, when I look back ZoeDIY was selling in these sizes, the filters on the images ranged 2mm, 3mm, 4mm, 6mm, 8mm, 10mm and 20mm and beyond. This shows that the same design is possible in almost every size, where the only thing that counts isn't the size, it's how it fits your piece.
Why Two Glass Beads With the Same Stated Size Look and Hang Differently
Part 2: shape & balance. Various beads, same mm on the label & even reading that, they are so different once they are in your hand. Different bead in your hand! The whys are well worth exploring!
Round or regularly repeated shapes
Round is the normal. Repeat neatly, all evenly spaced, keep a steady beat down a strand. Orientation hardly matters; they take the same shape no matter what way you turn them. For when you need stillness together, this is the place to remain. Good for stable repeated strands.
Directional, asymmetrical, or dimensional shapes
This another kettle of fish. A teardrop, a coin, a faceted or dimensional shape all 'almost' always will distort a little as they face (finishing again on a reflective surface will make a shape appear bigger or smaller as the actual size is different). Light plays strange tricks on glass. Re-orient the bead and it will appear an entirely different piece!
- Repetition multiple. Repeats of shapes with multiple repetitions will have a different look than repetitions with a single shape, but you know what I mean. Number 3 on this list, but most likely the most significant.
- Spacing. When beads are close together they look heavier, and when they are spaced apart they look lighter and more delicate.
- Relative weight & clearance of hardware. dimensional beads will be able to carry more weight than a flat bead of the same width-and also need clearance at the point where they meet your jump ring or wire or clasp.
The Pre-Order Specification Checklist
Quick and simple. Before you add any products to your cart, go through this pre checkout list. Do not assume anything is included just because it is not mentioned on the listing. Find the specific product page or move on to the next item on the list.
- Stated material
- Outside dimensions
- Center opening or hole measurement
- Shape and orientation
- Product specific weight (where the listing had this)
- Pack quantity
- The clearance of a cord, a wire, a rod, a jump-ring or a piece of hardware
For the most part, the written listing has it.. Photos are fine, overviews guides are good, but still building to the dimensions on the product page is what really matters (the page beats the image). Check the individual listing for the stated opening, finish, quantity and whether it will be suitable for your project-one listing at a time. Miss that and you're just hoping.
Number 5. My favorite and most often ignored pet peeve, Hardware Clearance. If a finding or clasp is going to be attached to a bead with a jump ring, it will need to be able to pass through the shape of the hardware. Nothing is more frustrating than a beautiful focal bead that cannot clear your findings.
How to Use ZoeDIY's General Size and Hole PDF
ZoeDIY gives you a printable reference guide you should have on hand-a general bead size and hole guide. It is three pages in length, and includes a general size chart, a hole size reference, thread and cord matching notes, and some glass-bead samples. Handy for orientation, but it is a general reference guide (not a glass-specific chart) and is not a guaranteed actual size measuring tool.
Couple of things to remember. print scale might be skewing the apparent size, so a millimeter sized bead you print on your home printer may not be as small as it looks - often the "fit to page" setting on your printer is the culprit. Written millimeter dimensions, and the details of each product, are more accurate than any of the eye-balling you do from the printed image. Use the PDF as a rough size guide, print it out, get a gist of it, then check the actual figures on the listing itself. Download from the FAQ below.
Where to Go Next
Three clear directions depending on what you need right now:
- Buy info. See current glass bead listings for product-specific measurements, openings, and pack info.
- Size references in general. Open the Shop by Size guide to find out more about sizes and holes for other types of beads.
- The other everything else. There are certainly lots of other ideas floating around at ZoeDIY and the complete list of all sorts of DIY fun!
FAQ
What exactly is the difference between outside dimension & hole size!
The outside size - the overall size of the bead- the aspect that you see on the strand, and how the scale is determined- visually. Hole size (or center opening) - the gap that goes through the centre of the bead for your stringing material to run through. They are measured separately, one does not imply the other.
So, why do two identical millimeter glass beads end up with different appearances?
Shape, orientation and finish. Two beads, a sphere and an angular shape, identical in size will appear to be two different objects, because a round surface diffuses light in a different way than an angular one, a reflective surface in a different way than a matte one… and not only that, but the directional shape will just hang in a different way.
is the dimension of an object identifiable from an image of that object alone
Nope. Even if that pictures shows the bead flat and lit up for the shot, it doesn't hang or scale like that in your piece. Read the listed measurements and center opening instead of sizing by eye from the picture.
Can I download a glass bead size chart PDF?
ZoeDIY provides a general bead size and hole guide that includes some glass-bead samples, not a glass-only chart. You can Download & Print PDF here. Please note that it is a general guide, so the displayed size may change depending on the print scale, and you should always check the size of the product you are receiving.
Is the PDF suitable as an actual-size reference when printing?
No. Print scaling might alter the size rendered, so don't use your standard printer as a correctly calibrated measuring device. Use it to rough things out, but if it really counts, go with the printed millimetres in each product listing.
which product detail is most important prior to order
The center opening ends up the failure point for most projects. An untimely cord, or wire, just will not go! Outside size and shape first, then weight or pack qty according to the card. Check that listing for its actual numbers every time. Number 1 on most projects really.
Before You Order
It's best to make it simple: take the current Glass Beads listings for all of the actual product level dimensions and specs, use Shop by Size and the general PDF for overall size and hole reference, and then take the written product listing for the final buying specs. The number on the page always beats the number in your head.
