Orvielle ·
Flat Back Earring Size Guide: Post Length, Gauge & Fit
The diamond catches your eye. The three numbers underneath decide whether the earring belongs in your stack.
When you shop for flat back earrings, “size” can mean the length of the post, its thickness, or the dimensions of the design at the front. Those measurements do different jobs. A delicate-looking diamond stud can still have a thicker post than the earrings you already wear.
This flat back earring size guide explains how to read each measurement, using an Orvielle diamond flatback stud as a real example. Start with fit, then choose the sparkle.
Flat back earring sizing: the quick answer
Post length tells you how long the wearable shaft is. Gauge tells you how thick it is. Front size tells you how much of the design you see. Check all three before choosing a flatback stud; a product photo cannot tell you whether the post fits your piercing.
| Measurement | What it describes | What to check |
|---|---|---|
| Post length | The shaft between the front and backing | The length appropriate for your particular piercing |
| Gauge / thickness | The diameter of the post | The gauge you currently wear and whether the new post matches |
| Front dimensions | The visible stud, setting or decorative shape | Its scale and spacing beside your other earrings |
| Stone dimensions | The size of an individual gemstone | Whether the listing describes the stone or the whole front |
What does flatback earring post length mean?
Post length is a fit measurement. It does not include the full height of the diamond setting or describe the width of the decorative front. When comparing listings, look specifically for “Post Length” and check any measurement diagram the maker provides.
You may see 6 mm, 6.5 mm or 8 mm posts while shopping. These are different lengths, not a scale of better and worse. A longer post is not automatically more comfortable, and a shorter one is not automatically a neater fit.
The Association of Professional Piercers explains that jewellery length and gauge need to suit the individual anatomy and placement. If you do not know your measurements, ask a professional piercer to assess the fit instead of choosing from a generic ear diagram. For a new or healing piercing, have your piercer select the appropriate jewellery.
What does 18G mean on an earring?
Gauge describes the thickness of the post, not its length. Orvielle’s Diamond Curve Stud – Single lists an 18G / 1.0 mm post. That 1.0 mm refers to the shaft that passes through the piercing.
A useful distinction: the same product also lists a 0.8 mm insertion pin. That is a separate specification; it does not make the earring’s post 0.8 mm thick. Read the post gauge itself when comparing earrings.
If your current jewellery has an unknown gauge, its front design will not reveal the answer. Check its original specification or ask your piercer to identify it. Do not force a thicker post into a piercing because the decorative end looks small.
Front size, diamond size and carat weight are different
A curved line of five small diamonds can cover more space across the ear than one round diamond. This is why total carat weight alone is not a useful guide to the footprint of a stud.
- Front width describes the visible design’s span when the listing identifies it that way.
- Diamond dimensions describe the stone itself. The surrounding setting can make the finished front larger.
- Carat weight measures gemstone weight, not the width of the earring.
For an ear stack, compare the decorative dimensions as well as the posts. Two studs can have the same gauge and post length while looking very different beside a hoop. Our Earring Style Guide is a useful next step once you have established your fit.
A real example: reading the Diamond Curve Stud specification
The current Diamond Curve Stud – Single listing brings several measurements together:
- Metal: 14K gold.
- Stones: five lab-grown diamonds, with a minimum total carat weight of 0.056 ct.
- Post: 6.5 mm long, 18G / 1.0 mm thick.
- Listed width: 7.8 mm.
- Closure: flat-back screw closure.
- Quantity: one single earring.
The 6.5 mm post is the length to compare for fit; the 7.8 mm width describes the design’s scale. Neither number is the diameter of each diamond. The listing also specifies VS+ clarity and D–F colour, which describe the diamonds rather than the size of the post.
Use this as an example of how to read a product page, not a recommended size for every ear. Always check the individual style you are buying rather than assuming every piece in a collection has identical measurements.
Screw-fit or threadless: check the closure too
“Flat back” describes the backing. It does not, by itself, tell you how the front attaches. A screw-fit design uses a threaded connection; a threadless design uses a press-fit connection. They are different mechanisms.
The Diamond Curve Stud uses a flat-back screw closure. Follow Orvielle’s Wearing Guide for the relevant design, and do not assume that a decorative end from another brand will fit its post just because the gauge is the same. Matching thickness is not confirmation that two components connect.
Before you add a flatback stud to your cart
- Confirm the post gauge and length. Compare with a known, well-fitting specification or get a piercer’s assessment.
- Check the decorative dimensions. Think about the space between your existing piercings and the look you want.
- Read the metal and closure details. “Gold” and “flat back” are starting points; look for the exact material and fastening.
- Check whether it is sold as a single or pair. The Diamond Curve Stud is sold individually, so one unit means one earring.
Flat back earring size FAQs
Is 6.5 mm the right post length for everyone?
No. It is the listed length of the example above, not a universal fit. Anatomy and piercing placement affect the length you need.
Does a smaller diamond mean a thinner post?
No. Diamond size and post gauge are separate specifications. Check both even when you are choosing a tiny stud.
Can I choose a flatback earring from a photo alone?
A photo helps you judge the design, but close-up photography changes your impression of scale. Use the written measurements to compare sizes before buying.
Where should I start with Orvielle flatback earrings?
Explore the OV 24/7 System, open the specifications for the styles you like, and compare their post measurements. Choose the fit first. Then build the combination that feels like you.