Size guide

How to Size a Tennis Bracelet, Stone and Length

Measuring your wrist, choosing between a 2mm and a 5mm stone, and which length suits which wrist, with every length in the Gemsme range counted.

Published 19 September 2026 ยท Prices updated 19 September 2026

A tennis bracelet has two sizes, and people mix them up. One is the length, which decides how it sits on your wrist. The other is the stone size, which decides how much it sparkles and how it stacks.

Get the length wrong and the clasp rubs or the bracelet slides over your hand. Get the stone wrong and a bracelet meant for every day looks like it belongs at a gala. Here is how the Gemsme team picks both.

  1. Wrap a soft tapeAround the wrist bone, where a watch strap sits. No tape? A strip of paper and a ruler work.
  2. Read it snugSnug, not tight. That number is your wrist size.
  3. Add half an inchAdd 1/2 to 3/4 inch for a tennis bracelet that moves a little without sliding over the hand.
Three steps before you pick a length.

Length: your wrist plus half an inch

Measure snug, where a watch strap sits. Then add room. Half an inch gives a close fit that still moves. Three quarters gives a looser drape that turns on the wrist. An inch or more starts to slide toward the hand and knock against the table.

Most wrists we hear about measure between 6 and 6.75 inches. So the 7 inch is the length most of our bracelets come in.

Tennis bracelet lengths, counted across every Gemsme tennis bracelet on the site.
Bracelet lengthWrist it suitsGemsme tennis bracelets in it
6 in5.25 to 5.5 in8
6.5 in5.75 to 6.0 in24
6.7 in5.95 to 6.2 in2
7 in6.25 to 6.5 in20
7 in6.25 to 6.5 in1
7.5 in6.75 to 7.0 in18
8 in7.25 to 7.5 in11
8.5 in7.75 to 8.0 in5

Measure the wrist with a soft tape where you wear a watch, then add half an inch to three quarters for a tennis bracelet that moves without sliding onto the hand.

Stone size: what 2mm to 6mm looks like

Stone size is the width of each stone across its face. It also sets the width of the bracelet. A 2mm line is a thread of light, easy to stack with a watch. A 3mm or 4mm bracelet is the classic width you notice on a wrist across a table. At 5mm and up the bracelet becomes the piece everyone sees first.

  • 2 mm5 tennis bracelets
  • 3 mm14 tennis bracelets
  • 4 mm12 tennis bracelets
  • 5 mm14 tennis bracelets
  • 6 mm3 tennis bracelets
Stone sizes drawn to one scale. Counts are Gemsme tennis bracelets offered in that stone size.

Round, square or halo

Round stones in four prongs are the classic look and throw light in every direction. Square and princess cut stones sit flatter and read more modern. A halo setting rings each center stone with smaller ones, so a 3mm stone reads larger than it is.

Colored and rainbow bracelets use the same settings with colored cubic zirconia. They are playful and stack well next to a plain white bracelet.

Stones and hardness

Every stone in a tennis bracelet takes knocks. Cubic zirconia rates 8.5 on the Mohs scale and moissanite 9.25, both well above everyday dust, so they keep their polish. The prongs and the plating wear sooner than the stones do.

The hardness of a stone indicates the stone's resistance to scratching or how the surface of the gem will respond to contact with a sharp point.

The clasp matters more than it looks

Most of our tennis bracelets close with a box clasp and a safety latch. It takes two hands the first week and one hand after that. Fold-over clasps close faster but can open if they catch. Adjustable bracelets slide to fit and suit gifts when you do not know the wrist.

Whichever you pick, close it over a table the first few times. A bracelet dropped on a tiled floor is the most common way a stone comes loose.