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3.5mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear wearing Astra 6-prong 3.5mm diamond stud earring.
Close-up of an woman's nose wearing Astra 6-prong 3.5mm diamond nose stud earring.
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra jewelry piercing styles group shot
3.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra threadless ends in three different sizes
3.5mm Astra Diamond Flat Back Stud in 14k Rose Gold
3.5mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear wearing Astra 6-prong 3.5mm diamond stud earring.
Video thumbnail
Close-up of an woman's nose wearing Astra 6-prong 3.5mm diamond nose stud earring.
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra jewelry piercing styles group shot
3.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra threadless ends in three different sizes
3.5mm Astra Diamond Flat Back Stud in 14k Rose Gold
Home 3.5mm Astra Diamond Flat Back Stud

3.5mm Astra Diamond Flat Back Stud

$694 $1,292 Est. Retail Value
3.5mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear wearing Astra 6-prong 3.5mm diamond stud earring.
Close-up of an woman's nose wearing Astra 6-prong 3.5mm diamond nose stud earring.
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra jewelry piercing styles group shot
3.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra threadless ends in three different sizes
3.5mm Astra Diamond Flat Back Stud in 14k Rose Gold
3.5mm Astra Diamond Flat Back Stud in 14k Yellow Gold
Close-up of an ear wearing Astra 6-prong 3.5mm diamond stud earring.
Video thumbnail
Close-up of an woman's nose wearing Astra 6-prong 3.5mm diamond nose stud earring.
Close-up of an ear with gold Astra diamond earrings and measurements labeled.
Side view of the Astra diamond flat back
Flat back labret sizing guide showing 18G and 16G gauges from 5mm to 9.5mm with ear piercing map
Astra jewelry piercing styles group shot
3.5mm Astra Diamond Flat Back Stud in 14k White Gold
Astra threadless ends in three different sizes
3.5mm Astra Diamond Flat Back Stud in 14k Rose Gold

Diamond Size

3.5mm Astra
2.5mm Astra 3.0mm 3.5mm Astra 4.0mm
Size Chart
Find Your Perfect Fit
✦
Flat back gauge and length sizing guide for ear piercings

How to size a flat back stud

A flat back stud has a decorative top that threads onto a post ending in a smooth, flat disc. The disc rests against the back of the piercing so it sits flush, won't snag, and stays comfortable enough to sleep on. Two measurements make it fit right: gauge (post thickness) and length (post span).

Gauge — the thickness of the post

Gauge is how thick the post is, and it should match what your piercer used so the stud seats securely without shifting. The scale runs in reverse — a smaller number is a thicker post, so an 18G post is thinner than a 16G. Most flat back ear and nostril piercings use 18G or 16G.

Length — the post that spans your piercing

Length is the distance from the flat disc to the front of the stud — the part that passes through your piercing, measured without the decorative top. While healing, a little extra room (often 8mm) leaves space for swelling; once healed, a shorter post (6mm or 5mm) keeps the top sitting close and flush. Too long and the top spins or catches; too short and the disc presses in.

Not sure? Match the gauge and length on jewelry that already fits you, or check with your piercer.

Still not sure about your size?
Our Piercing Advisors will help you find the right fit for your piercing.
Or add a Piercing Advisor™ fitting to your order › Need a size we don’t carry? Request custom sizing ›
Show info modal
Find Your Perfect Fit
✦
info popup jeweler direct
Still not sure about your size?
Our Piercing Advisors will help you find the right fit for your piercing.
Or add a Piercing Advisor™ fitting to your order › Need a size we don’t carry? Request custom sizing ›
Find Your Perfect Fit
✦
Promotional text for a free piercing advisor service with details on customization and quality assurance.
Still not sure about your size?
Our Piercing Advisors will help you find the right fit for your piercing.
Or add a Piercing Advisor™ fitting to your order › Need a size we don’t carry? Request custom sizing ›
i
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

Designed to make a statement with refined elegance, the Astra 3.5mm Diamond Flat Back Stud showcases a brilliant genuine diamond in Fresh Trends’ signature 6-prong setting. Handcrafted in solid 14k gold, the Astra is thoughtfully designed for comfortable long-term wear with a smooth flat back fit ideal for sensitive skin and everyday styling. Perfect for cartilage, helix, tragus, and lobe piercings, this luminous stud stands beautifully on its own or adds elevated brilliance to a curated ear stack.

  • Diamond Carat: .17ct (3.5mm)
  • 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

Four Astra Diamond Stud Earrings in various sizes White gold diamond earring on a white background
Astra Diamond Stud Earring $299
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
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 3.5mm diamond bezel flat back labret stud, angled view on marble surface 14k rose gold 3.5mm diamond bezel flat back labret, overhead angled view highlighting warm gold tone
3.5mm Diamond Bezel-Set 14k Gold Flat Back Stud $758
14k yellow gold ribbon bow diamond flat back stud, angled view showing flat disc backing Ribbon bow diamond flat back stud in all three 14k gold options: white, yellow, and rose gold
Ribbon Bow Diamond Flat Back Stud $266
14k yellow gold diamond pear climber flat back stud, angled view showing curved climbing silhouette 14k yellow gold diamond pear climber labret stud, side-angled view showing flat disc backing and post
Diamond Pear Climber Flat Back Stud $871

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 — $646

Est. Retail Value — $1,292

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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