Black Screw Back Stud Earrings

Earring Size, Weight & Comfort

Size, next to US coins

Coins are drawn to scale with each other. Sizes on product pages are height x width in mm and inches.

Weight & comfort

We weigh one earring, not the pair. US coins weigh a fixed amount, so they make a handy reference.

1. Featherlight0–2 gLighter than a dime (2.27 g). Our lightest pieces.
2. Lightweight2–4.5 gAbout one or two dimes. Easy to wear for most of the day.
3. Medium4.5–7 gAbout a nickel (5 g) or a quarter (5.67 g).
4. Substantial7–10 gAbout a quarter and a dime, up to two nickels.
5. Heavyweightover 10 gMore than two nickels. Among our heaviest.

Weight classes describe feel, not a guarantee of comfort or wear time.

Post thickness

• 22G0.64 mmFine post for most pierced ears
• 20G0.81 mmThe most common post
• 18G1.02 mmSlightly thicker
• 16G1.29 mmThicker, often for cartilage

Closures

Hinged Clicker

Open the hinge, pass the post through, and press until it clicks.

Hinged Snap Closure

Open at the hinge, pass the post through, and press until it snaps shut.

Butterfly Back

Push the post through, then slide the butterfly back on until snug.

Screw Back

Turn the back clockwise onto the threaded post until snug; turn counterclockwise to remove.

Omega Back

Pass the post through, then close the hinged clip onto it behind your ear.

Lever Back

Open the hinged lever, pass the wire through, and press the lever closed.

Where to wear

MOBODUC earrings are designed for the lobe and upper lobe of healed piercings.

Hoop size guide → · Clasps & closures →

Women’s Necklace Length & Fit

On adjustable necklaces the length class is based on the shortest setting.

How to measure

Lay a string around your neck where you’d like the chain to sit, then measure it. Pendants hang a little lower; for layering, leave about 2″ between necklaces.

Clasps

Lobster Clasp

Pull the small lever to open the claw, hook it through the ring, then let go.

Spring Ring Clasp

Pull the small tab back to open the ring, slip the jump ring in, then release.

Box Clasp

Press the tongue and slide it into the box until it clicks, then close the safety latch. Used on tennis styles.

Fold-Over Clasp

Lift the lever, fit it over the bar and press it flat until it snaps shut.

Full necklace length guide →

Men’s Necklace Length & Fit

On adjustable necklaces the length class is based on the shortest setting.

How to measure

Lay a string around your neck where you’d like the chain to sit, then measure it with a ruler.

Clasps

Lobster Clasp

Pull the small lever to open the claw, hook it through the ring, then let go.

Spring Ring Clasp

Pull the small tab back to open the ring, slip the jump ring in, then release.

Box Clasp

Press the tongue and slide it into the box until it clicks, then close the safety latch. Used on tennis styles.

Fold-Over Clasp

Lift the lever, fit it over the bar and press it flat until it snaps shut.

Full necklace length guide →

Women’s Bracelet Size & Fit

What the product page shows

Chain bracelet

Length, plus the extender range when there is one, e.g. 6.5” + 2” extender (adjustable 6.5”–8.5”).

Bangle & cuff

The wrist range it fits, e.g. “Fits wrists about 5.5”–7””.

How to measure

Wrap a tape measure, string or paper strip around your wrist just above the wrist bone, mark where it meets and measure it with a ruler. If you use a printable sizer, print it at 100% scale.

For a chain bracelet, add about 0.5” to your wrist size for a close fit or about 1” for a relaxed fit. An extender chain widens the range.

Clasps

Lobster Clasp

Pull the small lever to open the claw, hook it through the ring, then let go.

Spring Ring Clasp

Pull the small tab back to open the ring, slip the jump ring in, then release.

Box Clasp

Press the tongue and slide it into the box until it clicks, then close the safety latch. Used on tennis styles.

Fold-Over Clasp

Lift the lever, fit it over the bar and press it flat until it snaps shut.

Men’s Bracelet Size & Fit

What the product page shows

Chain bracelet

Length, plus the extender range when there is one, e.g. 6.5” + 2” extender (adjustable 6.5”–8.5”).

Bangle & cuff

The wrist range it fits, e.g. “Fits wrists about 5.5”–7””.

How to measure

Wrap a tape measure, string or paper strip around your wrist just above the wrist bone, mark where it meets and measure it with a ruler. If you use a printable sizer, print it at 100% scale.

For a chain bracelet, add about 0.5” to your wrist size for a close fit or about 1” for a relaxed fit. An extender chain widens the range.

Clasps

Lobster Clasp

Pull the small lever to open the claw, hook it through the ring, then let go.

Spring Ring Clasp

Pull the small tab back to open the ring, slip the jump ring in, then release.

Box Clasp

Press the tongue and slide it into the box until it clicks, then close the safety latch. Used on tennis styles.

Fold-Over Clasp

Lift the lever, fit it over the bar and press it flat until it snaps shut.

Ring Size & Fit

We make whole US sizes only (no half sizes). Each product page shows the sizes available for that ring.

How to measure

Measure the inner diameter of a ring that fits the same finger, or wrap a strip of paper around your finger and compare the circumference with the table. Measure at the end of the day when your fingers are warm, and make sure the ring can pass over your knuckle.

Wide bands (for example 8 mm) fit more snugly. If you are between sizes, choose the next size up. Tungsten rings cannot be resized, so please check your size before ordering.

If you use a printable ring sizer, print it at 100% scale. Measurements are approximate.