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14k yellow gold 3mm princess-cut diamond flat back stud, angled view showing four-prong setting and disc backing
Princess-cut diamond flat back studs worn in triple lobe piercing stack on model's ear
3mm princess-cut diamond flat back stud shown in nose piercing for fit and size reference
Three graduating princess-cut diamond ends balanced on fingernail showing rainbow light dispersion
14k yellow gold princess-cut diamond stud in triple lobe stack with pear and round diamond flat back studs
14k white gold 3mm princess-cut diamond flat back stud end, top-down front view showing faceted square diamond
3mm princess-cut diamond flat back stud end pinched between fingertips for size reference
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Diagram comparing threadless push-pin vs threaded flat back labret styles in 14k yellow gold
Four-step how-to guide for bending and inserting a threadless push-pin end into a cartilage piercing
14k yellow gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k yellow gold princess-cut diamond flat back stud, side-angle view showing four-prong setting and round disc back
14k white gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k rose gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
Close-up of 14k white gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k yellow gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k rose gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
14k yellow gold 3mm princess-cut diamond flat back stud, angled view showing four-prong setting and disc backing
Princess-cut diamond flat back studs worn in triple lobe piercing stack on model's ear
Video thumbnail
Video thumbnail
3mm princess-cut diamond flat back stud shown in nose piercing for fit and size reference
Three graduating princess-cut diamond ends balanced on fingernail showing rainbow light dispersion
14k yellow gold princess-cut diamond stud in triple lobe stack with pear and round diamond flat back studs
14k white gold 3mm princess-cut diamond flat back stud end, top-down front view showing faceted square diamond
3mm princess-cut diamond flat back stud end pinched between fingertips for size reference
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Diagram comparing threadless push-pin vs threaded flat back labret styles in 14k yellow gold
Four-step how-to guide for bending and inserting a threadless push-pin end into a cartilage piercing
14k yellow gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k yellow gold princess-cut diamond flat back stud, side-angle view showing four-prong setting and round disc back
14k white gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k rose gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
Close-up of 14k white gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k yellow gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k rose gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Home 3mm Princess-Cut Diamond Flat Back Stud

3mm Princess-Cut Diamond Flat Back Stud

$805 $1,520 Est. Retail Value
14k yellow gold 3mm princess-cut diamond flat back stud, angled view showing four-prong setting and disc backing
Princess-cut diamond flat back studs worn in triple lobe piercing stack on model's ear
3mm princess-cut diamond flat back stud shown in nose piercing for fit and size reference
Three graduating princess-cut diamond ends balanced on fingernail showing rainbow light dispersion
14k yellow gold princess-cut diamond stud in triple lobe stack with pear and round diamond flat back studs
14k white gold 3mm princess-cut diamond flat back stud end, top-down front view showing faceted square diamond
3mm princess-cut diamond flat back stud end pinched between fingertips for size reference
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Diagram comparing threadless push-pin vs threaded flat back labret styles in 14k yellow gold
Four-step how-to guide for bending and inserting a threadless push-pin end into a cartilage piercing
14k yellow gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k yellow gold princess-cut diamond flat back stud, side-angle view showing four-prong setting and round disc back
14k white gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k rose gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
Close-up of 14k white gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k yellow gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k rose gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
14k yellow gold 3mm princess-cut diamond flat back stud, angled view showing four-prong setting and disc backing
Princess-cut diamond flat back studs worn in triple lobe piercing stack on model's ear
Video thumbnail
Video thumbnail
3mm princess-cut diamond flat back stud shown in nose piercing for fit and size reference
Three graduating princess-cut diamond ends balanced on fingernail showing rainbow light dispersion
14k yellow gold princess-cut diamond stud in triple lobe stack with pear and round diamond flat back studs
14k white gold 3mm princess-cut diamond flat back stud end, top-down front view showing faceted square diamond
3mm princess-cut diamond flat back stud end pinched between fingertips for size reference
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Diagram comparing threadless push-pin vs threaded flat back labret styles in 14k yellow gold
Four-step how-to guide for bending and inserting a threadless push-pin end into a cartilage piercing
14k yellow gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k yellow gold princess-cut diamond flat back stud, side-angle view showing four-prong setting and round disc back
14k white gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
14k rose gold 3mm princess-cut diamond flat back labret, angled view showing threadless post and flat disc backing
Close-up of 14k white gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k yellow gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs
Close-up of 14k rose gold 3mm princess-cut diamond threadless end showing angular facets and four ball prongs

Diamond Size

3.0mm
1.5mm 1.75mm 2.5mm 2.0mm 3.0mm
Size Chart

Sizing Piercing Jewelry

Choosing the right size ensures comfort, healthy healing, and a flawless look. Use this guide to understand gauge, length, and diameter, then confirm your fit with the conversion charts below.

What Is “Gauge”?

The gauge of your piercing is the thickness of the bar that passes through your piercing—i.e., the barbell’s thickness. Note the system is inverse: a lower number = thicker bar. For example, a 12G barbell is thicker than a 20G barbell.

Piercing Jewelry “Length”

The length of your piercing jewelry refers to the wearable span of a straight or curved barbell—the section that sits inside the piercing. It’s measured end-to-end on the bar and excludes any ends, balls, or charms.

measuring length of a flat back earring measuring length of a nose ring



measuring length of a straight barbell measuring length of curved barbell


Piercing Jewelry “Diameter”

The diameter is used for circular styles—hoops, captives, clickers, seam rings, and circular barbells. Measure from the innermost, widest point across the inside of the hoop.

measuring diameter of captive bead ring measuring diameter of circular barbell

Standard Piercing Sizes

Check the chart below for typical starting sizes. Like clothing, anatomy varies—your ideal size may differ.

💡 Tip: Measure a comfortable piece you already wear to confirm your fit.


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Made to order: Ready in 1–2 weeks

Solid 14k Gold

Jeweler Direct

Handmade

Piercing Advisor

Ethical Luxury

Lifetime Warranty

Looking for something different? Request a custom design →

Product Description

Description

The 3mm Princess-Cut Diamond Flat Back Stud delivers crisp brilliance with its iconic square silhouette and sharp corners. Its faceting pattern creates bright, angular flashes, making it a standout centerpiece or upper-ear accent. Handcrafted in solid 14k gold.

Details

  • 3mm size (0.18 ct) | Conflict-free

  • VS Diamond Clarity | G–H Color

  • Solid 14k gold, nickel-free & hypoallergenic

  • Comfortable 3mm disc backing

  • Threadless end-only option includes a free 16g 6mm titanium backing

  • Ideal for lip, labret, tragus, helix, conch, cartilage, and nose piercings

  • Ethically handmade in California

Product Details
Materials
Shipping

Pairs Well With

Flat back earring insertion tool beside a gold CZ flat back stud, showing tool and jewelry separately Insertion tool being used in a helix piercing on a model, with gold CZ chain connector studs in lobe
Flat Back Earring Easy Insertion Tool $14
14k yellow gold plain clicker ring hoop, front view with inset showing open clasp detail 14k rose gold plain clicker ring hoop, 12G front view with bold tube width and warm rosy finish
14k Gold Plain Hoop Clicker Ring $318
FreshTrends mint green travel jewelry box, closed front view with gold FT Est. 2003 logo Close-up of travel jewelry box interior holding gold piercing studs, earrings, and CZ body jewelry
Travel Jewelry Box $17
14k yellow gold fixed bead ring with princess-cut CZ in corner mount setting, front view 14k yellow gold fixed bead ring with princess-cut CZ, open view showing corner mount bead detail
Cubic Zirconia Princess Cut Corner Mount 14k Gold Fixed Bead Ring $284
14k yellow gold 3mm emerald-cut diamond flat back labret stud, angled studio shot showing prong setting Four-step how-to guide for bending and inserting a threadless push-pin end into a cartilage piercing
3mm Emerald-Cut Diamond Flat Back Stud $436
14K yellow gold polished heart flat back labret, angled view showing barbell and disc backing 14K rose gold polished heart flat back labret, front view showing warm pink-gold finish
4mm Heart Artisan Polished 14K Gold Flat Back $169

Jeweler-Direct Pricing

Jeweler-Direct means crafted, just for you. By skipping the middleman, we eliminate traditional retail markups — so you can enjoy luxury piercing jewelry without the inflated price.

Fresh Trends Price — $760

Est. Retail Value — $1,520

Fresh Trends Piercing Advisor™

Our complimentary Piercing Advisor™ service ensures your jewelry fits perfectly. After your order, a specialist reviews your selection, verifies your size, and guides you through any adjustments. For jewelry to be eligible for an adjustment, FreshTrends Piercing Advisor™ must be added to your cart at the time of original purchase.

Why It Matters:

• Anatomy varies, and size is crucial

• A specialist confirms your fit before we craft your piece

• You get a flawless, comfortable result—every time

Piercing Advisor Service

Handcrafted Just For You!

Our in-house jewelry designer and artisans create one-of-a-kind piercing jewelry from solid 14k gold and 950 platinum, always 100% nickel-free.

Each piece is made-to-order and never mass-produced, allowing for many gemstone and size options for the perfect fit. We take pride in hand-crafting fine body jewelry in the USA.

Fresh Trends Fine Jewelry

Because every piercing deserves its masterpiece.

Ready to Gift

Your jewelry arrives in our signature packaging—a keepsake box with a soft green pouch and a Wear & Care Guide. Premium pieces are showcased in an LED presentation box that elevates every gifting moment.

Fresh Trends Packaging

Fresh Trends® Lifetime Warranty

Every piece we craft is designed for lifelong wear. If your jewelry ever shows a manufacturing defect, we’ll repair or replace it—complimentary, for life.

Lifetime Confidence. Handmade Quality.

Gold earring with clear gemstones on a soft pink fabric background

Sustainable Jewelry

We use recycled metals to help reduce the carbon footprint of manufacturing and the negative impact of metal mining.

We plant one new tree per order in partnership with Ecologi to help restore nature and reduce the carbon footprint of our operations.

ecology

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