Size & Measurement Guide

Every measurement here comes from our own production drawings, so these are the pieces you receive rather than a generic chart.

Each product page also carries its own measurements in millimetres, under Details and dimensions. If you are between sizes, or buying this as a gift, email hello@theirstudios.com and we will help you choose.

Rings

Our rings run from a size 3 to a size 11. Most styles are made in 5 to 10, the signets and the solid gold rings in 6 to 11, and the pinky rings in 3 to 8.

Three ways to find your size

  1. Measure a ring you already wear. Lay it flat and measure straight across the inside, edge to edge, in millimetres. Match that to the inside diameter below. This is the most reliable thing you can do at home.
  2. Measure your finger. Cut a strip of paper about 5mm wide, wrap it snugly around the base of your finger, mark where it meets, then lay it flat against a ruler. That figure is your inside circumference.
  3. Print our sizer. It is at the bottom of this page, with both a paper strip and a set of circles to lay a ring over.
US size Inside diameter Inside circumference
3 14.1 mm 44.2 mm
3.5 14.5 mm 45.5 mm
4 14.9 mm 46.8 mm
4.5 15.3 mm 48.0 mm
5 15.7 mm 49.3 mm
5.5 16.1 mm 50.6 mm
6 16.5 mm 51.9 mm
6.5 16.9 mm 53.1 mm
7 17.3 mm 54.4 mm
7.5 17.7 mm 55.7 mm
8 18.1 mm 57.0 mm
8.5 18.5 mm 58.2 mm
9 18.9 mm 59.5 mm
9.5 19.4 mm 60.8 mm
10 19.8 mm 62.1 mm
10.5 20.2 mm 63.3 mm
11 20.6 mm 64.6 mm

On fit

  • Fingers are at their largest at the end of the day and in warm weather. Measure then, not first thing in the morning.
  • A wide band sits tighter than a thin one. On the Natalie Thick Dome, the Harper Chunky and the signets, take the larger size if you are between two.
  • If your knuckle is much wider than the base of your finger, size for the knuckle. The ring has to get past it.
  • Solid gold and sterling silver can be resized by a local jeweler. Vermeil cannot, because resizing breaks the gold layer, so it is worth measuring twice.

Necklace lengths

Where a chain sits depends on your height and build as much as on the length. On an average adult frame:

15 to 16 in 18 in 20 in 22 in
  • 15 to 16 inches sits at the base of the neck.
  • 18 inches sits just below the collarbone. This is the length most people own.
  • 20 inches sits at the top of the sternum, and layers cleanly over an 18.
  • 22 inches sits mid chest, and reads best over a shirt or a knit.

What we make

16 inches, adjustable to 15 Camille Solitaire
18 to 20 inches, adjustable Sutton, Bowie, Cameron, St. Christopher
18 inches with an extender Bodhi
18 or 22 inches Toni, St. Judes, Finn, Harlow
20 inches, fixed Jessie, Coleman

Bracelets, cuffs and the anklet

Chain bracelets are made in 7 and 8 inches, most of them adjustable or with an extender. To find your size, wrap a strip of paper around your wrist just below the wrist bone, mark it and measure it flat, then add about half an inch so it moves.

7 inches with a 1 inch extender Aly
7 and 8 inches Mason, Olive
7.5 inches, adjustable Dylan
8 inches, adjustable Noah, Reese, Ziggy, Connor, Ezra
One size, 57mm internal Zion, Ryan, Scarlett, Remi cuffs
One size, 60mm inner diameter Ruby Bangle
9 inches with a 1 inch extender Maya Anklet

A cuff is open at the back, so it eases on and can be pressed very gently to fit. Open and close it as little as you can, since metal fatigues where it bends. The Ruby bangle is closed, so it has to pass over the widest part of your hand.

Earrings

Claire Drop Earrings worn, showing how a short drop sits against the ear

Claire Drop Earrings, worn.

Drop length is the measurement people misjudge most, so every earring page carries its total length in millimetres under Details and dimensions. For a sense of the range:

Studs, 3 to 16mm Andy 3mm, Mia 8mm, Billie 13mm, Hannah 16mm
Huggies, 15 to 23mm Elli 15mm, Maverick 22.5mm
Hoops, 15 to 51mm Talia Small 15mm, Talia Medium 25mm, Anna 30mm, Kirby 33.5mm, Maddie 50.7mm
Drops, 20 to 50mm Jordan 30mm, Danny 32.5mm, Sunny 39mm, Blake 45mm, Sophia 50.5mm

The ruler on the printable sheet below prints life size, so you can hold a length against your own ear in the mirror before you decide.

Print at home

Print this section at 100%, with any scale to fit or shrink to fit setting turned off, then check the 50mm bar before you measure anything. If it is wrong, the sizes will be too.

First, check the scale

The bar below should measure exactly 50mm against a ruler. If it does not, the print scale is wrong and so are the sizes.

50 mm

Lay a ring over these

Match the inside of a ring you already wear to the circle it covers exactly. The figure underneath each size is the inside diameter.

314.1
3.514.5
414.9
4.515.3
515.7
5.516.1
616.5
6.516.9
717.3
7.517.7
818.1
8.518.5
918.9
9.519.4
1019.8
10.520.2
1120.6

Or wrap this strip around your finger

Cut along the outside, wrap it around the base of your finger with the numbers facing out, and read the size at the point where the end of the strip meets it.

Wrap the left hand end around your finger first.

3 4 5 6 7 8 9 10 11

Life size ruler in millimetres, for drops and lengths

0 10 20 30 40 50 60 70

If it does not fit

You have 30 days from delivery to send something back or exchange it, through the returns portal linked in our FAQs. Tell us what happened and we will get the right size to you.

Still deciding? Email hello@theirstudios.com with the two sizes you are torn between and we will tell you what we would pick.