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2.5mm 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
2.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
2.5mm Astra Diamond Flat Back Stud in 14k Rose Gold
2.5mm 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
2.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
2.5mm Astra Diamond Flat Back Stud in 14k Rose Gold
Home 2.5mm Astra Diamond Flat Back Stud

2.5mm Astra Diamond Flat Back Stud

$284 $492 Est. Retail Value
2.5mm 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
2.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
2.5mm Astra Diamond Flat Back Stud in 14k Rose Gold
2.5mm 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
2.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra jewelry piercing styles group shot
2.5mm Astra Diamond Flat Back Stud in 14k Rose Gold

Diamond Size

2.5mm Astra
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

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Lifetime Warranty

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Product Description

Description

The 2.5mm Astra Diamond 6 Prong Flat Back Stud features a brilliant round diamond in a six-prong setting on a flat back post. Handcrafted in solid 14k gold, this flat back stud is made for comfortable everyday wear in cartilage, helix, tragus, lobe, lip, and nose piercings. The smooth flat back design offers a secure, irritation-free fit ideal for sensitive skin and long-term wear.

  • Diamond Carat: .06ct (2.5mm)
  • 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
Shipping

Pairs Well With

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 2.5mm diamond bezel-set flat back labret, angled view on warm neutral surface 14k rose gold 2.5mm diamond bezel-set flat back labret, angled view showing warm pink-gold setting
2.5mm Diamond Bezel-Set 14k Gold Flat Back Stud $334
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
2.5mm Astra Diamond Nose Ring Astra jewelry piercing styles group shot
2.5mm Astra Diamond Nose Ring $248
14k yellow gold, diamond Jasmine flat back stud earring on a glass reflective surface Rose gold jasmine flower diamond stud
Jasmine Diamond Flat Back Stud $893
14k yellow gold triangle diamond flat back labret stud, angled view showing post and flat disc backing 14k white gold 2.5mm triangle diamond threadless push-pin end only, angled view with titanium post
2.5mm Triangle Diamond Flat Back Stud $295

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 — $246

Est. Retail Value — $492

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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