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3mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Close-up of a woman's face with a diamond nose ring.
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra threadless ends in three different sizes
3mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
3mm Astra Diamond Flat Back Stud in 14k Rose Gold
3mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Close-up of a woman's face with a diamond nose ring.
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra threadless ends in three different sizes
3mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
3mm Astra Diamond Flat Back Stud in 14k Rose Gold
Home 3mm Astra Diamond Flat Back Stud

3mm Astra Diamond Flat Back Stud

$432 $794 Est. Retail Value
3mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Close-up of a woman's face with a diamond nose ring.
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra threadless ends in three different sizes
3mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
3mm Astra Diamond Flat Back Stud in 14k Rose Gold
3mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Close-up of a woman's face with a diamond nose ring.
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra threadless ends in three different sizes
3mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
3mm Astra Diamond Flat Back Stud in 14k Rose Gold

Diamond Size

3.0mm
2.5mm Astra 3.0mm 4.0mm
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

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Product Description

Description

Elegant with a touch of bold brilliance, the Astra 3mm Diamond Flat Back Stud features a genuine diamond secured in Fresh Trends’ signature 6-prong setting. The 3mm diamond size offers a noticeable, luminous presence without overpowering your curation, making it perfect for cartilage, helix, tragus, and lobe piercings. Crafted in solid 14k gold and handmade in the USA, this flat back stud is designed for exceptional comfort, long-term wear, and sensitive skin.

  • Diamond Carat: .10ct (3mm)
  • Diamond Clarity: VS1
  • Solid 14k Gold | Hypoallergenic & Nickel-free
  • 18G threadless and 16G threaded/threadless options
  • Post lengths: 3/16" (5mm), 1/4" (6mm), and 5/16" (8mm)
  • Made to order in the USA
Product Details
Materials
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Pairs Well With

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Jasmine Diamond Flat Back Stud $893
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Travel Jewelry Box $17
14k yellow gold 3mm diamond bezel-set flat back labret stud on marble surface, angled hero shot 14k rose gold 3mm diamond bezel-set flat back labret stud, angled front view on white background
3mm Diamond Bezel-Set 14k Gold Flat Back Stud $578
3mm Astra Diamond Nose Ring Astra Diamond Threadless Ends
3mm Astra Diamond Nose Ring $399
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Flat Back Earring Easy Insertion Tool $14
14k yellow gold 3mm heart-cut diamond flat back labret stud, angled view showing disc backing 14k white gold 3mm heart-cut diamond threadless push-pin end only, angled view showing setting detail
3mm Diamond Heart Flat Back Stud $437

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 — $397

Est. Retail Value — $794

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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