Seed Bead Size Conversion
    
Aught SizeMillimetre SizeBeads Per InchAdditional Notes
    
Seed Beads 6/0 or 6º3.3 mm10 
Seed Beads 7/0 or 7º2.9 mm  
Seed Beads 8/0 or 8º2.5 mm13 
Seed Beads 9/0 or 9º2.2 mm15 
Seed Beads 10/0 or 10º2.0 mm16 
Seed Beads 11/0 or 11º1.8 mm19Miyuki Delicas, typically used for off-loom weaving, peyote stitch, brick stitch, square stitch and African helix, tend to come up smaller at 1.6mm
Seed Beads 12/0 or 12º1.7 mm20Including Miyuki Delica and Toho Treasure or Aiko 11/0 or 11º
Seed Beads 13/0 or 13º1.5 mm27 
Seed Beads 14/0 or 14º1.4 mm24 
Seed Beads 15/0 or 15º1.3 mm25 
Seed Beads 16/0 or 16º1.2 mm Special Order or Vintage Seed Beads Only
Seed Beads 18/0 or 18º1.1 mm Special Order or Vintage Seed Beads Only
Seed Beads 20/0 or 20º1.0 mm Special Order or Vintage Seed Beads Only
Seed Beads 22/0 or 22º0.9 mm Special Order or Vintage Seed Beads Only
    
    
    
Seed Bead Finishes  
    
FinishDescription  
    
Alabaster Seed BeadA dense translucent milky white or tinted finish  

"Aurora Borealis" Seed Bead or AB

(= Nordlicht)

An iridescent rainbow effect finish applied to the surface of the seed beads. Usually applied to one side of a bead but it can be used over the entire surface.  
Ceylon Seed BeadA pearl lustre surface finish or inside colouring of opaque beads  
Dyed Seed BeadA seed bead that has been surface dyed to a secondary colour. The colouring is on the surface and therefore can rub off over time  
Galvanised Seed BeadA coloured surface coating or plating with a metal appearance. Techniques have improved but there is potential for this surface coating to rub off  
Black Lined Seed BeadA black coating applied to the inside wall of a transparent or coloured seed bead adding depth of colour  
Brass Lined Seed BeadA brass like coating which reflects a brass light when applied to the inside wall of a transparent or coloured seed bead  
Bronze Lined Seed BeadA bronze like coating which reflects a brown light when applied to the inside wall of a transparent or coloured seed bead  
Copper Lined Seed BeadA copper like coating which reflects a reddish light when applied to the inside wall of a transparent or coloured seed bead  
Silver Lined Seed BeadA silver like coating which reflects light when applied to the inside wall of a transparent or coloured seed beads  
Frost Seed BeadMatte frosted beads typically in bronze, gold or rainbow finishes  
Iris Seed BeadAn amazing iridescent coating when applied to dark opaque seed beads. Typically a rainbow based around purple  
Lustre Seed BeadA transparent bead with a subtle pearl, silver, or gold surface finish producing a soft reflected light  
Marbled Seed BeadA recent Toho seed beads innovation taking an opaque bead and giving it a marbled surface coating. Also available as gilded marble with a surface coating of uneven gilding over the marbled surface  
Matte Seed BeadThe seed beads are etched at a microscopic level producing a dull finish that does not reflect light  
Metallic Seed BeadA shiny, vibrant metal surface coating or plating over an opaque or transparent base giving the appearance of metal, typically bronze or gunmetal  
Opal Seed BeadA translucent seed bead lined with silver or gold  
Opaque Seed BeadSeed beads that are solid in colour and therefore not transparent  
Pearl Seed BeadAn opaque seed bead given a pearlised surface coating  
Rainbow Seed BeadAn iridescent coating on the outside of either an opaque or transparent bead  
Satin Seed BeadSeed beads made from translucent low lustre glass  
Stripe Seed BeadSeed beads made with two or more glass colours  
Translucent Seed BeadGlass seed beads that allow diffused light to pass through them  
Transparent Seed BeadGlass seed beads that are see through even when coloured. With lighter colours these beads look almost clear