Home / Journal / What "20mm Beads" Actually Means (With a Caliper)
Written by the BEADORO studio · Updated October 2026 · 6 min read
20 mm is the diameter of a single bead, measured across its widest point with calipers: a 20 mm bead reads 20.0 mm. That's roughly three times the diameter of a common 6 mm bead, and it's a deliberate statement size - bold enough to be noticed, sized so a strand uses only 12 beads and stays light on the wrist.
Bead size is the diameter - the distance straight across one bead. Lay a bead flat and close a caliper on its widest point; the reading is the bead size. So 20 mm beads means each bead is 20 millimetres across, about 0.79 inches. A strand of them is a 20 mm bracelet.
A 6 mm bead is the subtle, everyday size you see in most beaded bracelets; it reads as a thin line on the wrist. A 20 mm bead is more than three times that diameter, so one 20 mm bead covers the width of three to four 6 mm beads side by side. Visually, 6 mm disappears under a sleeve; 20 mm is the piece people notice across a room. The trade is weight and bead count: a 6 mm strand needs 20-plus tiny beads, while a 20 mm strand needs only 12 - so the bigger bracelet is surprisingly light.
Three reasons. First, a single size fits most adults - the 20 mm, 12-bead strand is strung on elastic cord with an inner circumference of about 18.5 cm (7.3 in), covering 16-19 cm (6.3-7.5 in) wrists, relaxed on the smaller end and snug on the larger. Second, fewer, larger beads make the bracelet read as one confident object rather than a busy string. Third, 20 mm shows off the stone-look finishes - the color-shift of Aurora, the cat-eye band of Rose, the starry scatter of Bluesand - far better than a small bead ever could.
Take a BEADORO bead and a caliper. Close the jaws across the bead's equator (not corner to corner, not end to end). A 20 mm bead reads 20.0 mm. For comparison, a 6 mm bead reads 6.0 mm, and a US nickel is about 21.2 mm across - so a single 20 mm bead is just shy of a nickel's width. If you ever receive a bracelet advertised as 20 mm and the caliper reads 8 or 10 mm, the listing was describing the strand's look, not the bead - ask the seller what they actually measured.
It's a statement size, not a subtle one - that's the point. On a 15-16 cm wrist it reads bold rather than oversized; on a 17-18.5 cm wrist it sits just right. Because the strand uses only 12 beads, it stays light despite the size. If you want something quieter, the matte Ivory finish visually weighs less than a glossy bead.
Because the strand uses only 12 beads, it stays light - roughly 50 g - so it is comfortable from morning to night despite the size. It pairs well with a watch on the other wrist, and it stacks with smaller beads if you want contrast. The one habit that protects it is rolling it on and off rather than stretching it over the hand, which keeps the elastic cord healthy for years.
BEADORO beads are resin with stone-look finishes, not natural gemstone. The 20 mm size is about presence and wearability, not about rarity - which is also why the bracelet lands at $28.90-33.90 instead of the $90-200 a real stone strand of this size would cost. The size, the fit and the finish are real; the gem part is the look.
They read bold rather than oversized on a 15-16 cm wrist; the standard strand sits relaxed there. If her wrist is under 16 cm, message us about a custom size.
Twelve. A 20 mm, 12-bead strand on elastic cord has an inner circumference of about 18.5 cm, which fits 16-19 cm wrists.
20 mm is over three times the diameter of 6 mm; one 20 mm bead spans three to four 6 mm beads. 6 mm is subtle, 20 mm is a statement.