How to read one row
The ledger treats a size name as a sorting label, not a measurement system. MIYUKI describes millimeter values as approximate. TOHO describes its own hole and shape features. PRECIOSA maintains a document index with catalogs, product cards, certificates, and resistance documents. Those are useful lanes precisely because they do not claim to be one universal table.
A source column is part of the value. When a page tells you who published a number, which family it belongs to, and when it was checked, you can make a later substitution without losing the original reasoning. The ledger stays small so every row can keep its scope visible.
Signature resource
The Bead Spec Ledger
Separate source lanes keep a publisher's approximate value from becoming a false conversion promise.
Source lanes
MIYUKI, TOHO, and PRECIOSA remain separate records. The shelf grows only when source and scope are clear.
| Publisher | Family | Published cue | Bench consequence | Source |
|---|---|---|---|---|
| MIYUKI | Seed bead families | Approximate size and shape reference | Keep family and unit attached | MIYUKI size table |
| MIYUKI | Color and finish | Durability lookup with caution codes | Treat warnings as conditions | MIYUKI durability |
| TOHO | Glass bead shapes | Shape and hole-profile descriptions | Plan passes around the form | TOHO shapes |
| PRECIOSA | Seed beads and shapes | Catalogs, cards, certificates, resistance | Check document scope and date | PRECIOSA downloads |
Values remain approximate or source-specific where the publisher says so.
Bench checklist
Before you commit
- Identify the maker and exact family before reading a size label.
- Keep approximate values marked as approximate.
- Record the document or lookup date.
- Test the actual lot when alignment or thread passes matter.
Keep the caveat
What this page leaves visible
A familiar label can organize a question, but it cannot prove that two materials are interchangeable. Keep the publisher's caveat attached and leave unknowns visible.
Evidence pack
Sources close to the decision
- MIYUKI Co., Ltd.: Size and Shape of Seed BeadsMIYUKI seed bead family names and approximate millimeter values.The publisher describes the millimeter figures as approximate and keeps the product families separate. Checked August 24, 2026.
- MIYUKI Co., Ltd.: Seed bead count and weight referenceA source lane for comparing approximate count and weight information.Counts can vary with manufacturing lots, shapes, and finishes; this is not a universal conversion table. Checked August 24, 2026.
- TOHO BEADS: Glass BeadsTOHO shape names, hole-profile descriptions, and the stated distinction between round, cylinder, cut, bugle, and specialty forms.The descriptions are manufacturer information; a design still needs a short fit test before substitution. Checked August 24, 2026.
- TOHO BEADS: Beads Per Kg ChartA separate source lane for approximate weight and count information by TOHO family.Keep the TOHO lane separate from MIYUKI or PRECIOSA values and retain the source's approximate status. Checked August 24, 2026.
- PRECIOSA ORNELA: DownloadsCurrent catalogs, product information cards, certificates, and resistance documents for PRECIOSA families.A certificate or test report has a stated scope and date; it must not be generalized to every color or product. Checked August 24, 2026.