3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in white gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in white gold, on the hand
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in white gold, wearing
Oval Blue Sapphire & Diamond Half Eternity Band in 14K white gold, profile
Oval Blue Sapphire & Diamond Half Eternity Band in 14K white gold, angle view
Oval Blue Sapphire & Diamond Half Eternity Band in 14K white gold, front
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in yellow gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in yellow gold, on the hand
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in yellow gold, wearing
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) angle view in 14K Yellow Gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) profile in 14K Yellow Gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) side view in 14K Yellow Gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in rose gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in rose gold, on the hand
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) in rose gold, wearing
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) angle view in 14K Rose Gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) profile in 14K Rose Gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm) side view in 14K Rose Gold
3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm)

3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm)

Handcrafted by our family workshop · Made to order

Regular price$1,750.00
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Lifetime Warranty
Insured Shipping
Stone Inlay® & Engraving
Online Appraisal
Luther's Brown Box
Material

Before you order

Good to know

When will it arrive?

About 4–5 weeks to your door. Every piece is made to order in our studio, then shipped free, fully insured and signature-required.

Have a proposal or wedding date? Tell us before you order and we'll confirm honestly whether we can make it.

How do I get my size right?

Please take a minute with it. Use our printable sizing guide at 100% scale, measure at the end of the day, and measure twice. Quarter sizes are fine, and we can work from US, EU or mm. We confirm your size with you before we start.

Wide bands (around 5–6mm and up) feel snugger, so many people go up a quarter to half size.

Engraving & Stone Inlay®: what's included?

Engraving is on us. The engraving box above shows this band's limit, and spaces count. Your own handwriting is free too: just send a photo in black ink on white paper.

Ordering a matching set with two different engravings? Place your order, then message us your order number with what goes on each ring.

Will it sit flush with my engagement ring?

Most of our settings pair with a straight band. Some, like The Magnolia, sit low enough to need a contour band that curves around the center. Send us your ring and we'll tell you which band fits it best.

Is it ethically sourced?

Your sapphire is lab-grown: the same mineral as a mined sapphire, with the same color and hardness, grown instead of mined.

It comes with a report from AGL (Antwerp Gemological Laboratory), so you know exactly what you're wearing.

Any diamonds on this piece, accents included, are lab-grown too.

Adding Stone Inlay®? Those birthstones vary: some are lab-grown and some are natural. Just ask about yours.

More on our stones

Can I return it?

You can cancel for a full refund before production starts. Once your piece is at the bench it's a final sale, since it's made to your exact choices. If it arrives damaged or has a craftsmanship issue, tell us within 14 days and we'll make it right.

More answers in our FAQ, or start a custom build.

A bold half-eternity band designed with alternating oval blue sapphires and oval diamonds for rich color and brilliant contrast. The deep blue sapphires bring a vivid, regal look, while the diamonds add bright white sparkle across the front of the band.

At 5mm wide and 3.35ctw, this ring has a strong statement presence while still feeling refined enough for weddings, anniversaries, or stacking with other bands. Available in 14K solid gold or Platinum 950, it’s a timeless colored-stone band with a modern, high-impact finish.

Material

14K Solid Gold or Platinum 950

Main Stone

Sapphire

Side/Accent Stones

Diamond

Band Width

5mm

Stone

6x 3x5mm, 0.35ct Each, 2.10ctw Oval-Cut Lab-Grown Blue Sapphires
5x 3x5mm, 0.25ct Each, 1.25ctw Oval-Cut Lab-Grown Diamonds (D, E color, VS1+ clarity)

Key Features

Alternating Sapphire & Diamond Design

Oval blue sapphires and oval diamonds alternate across the band for bold color contrast and balanced brilliance.

3.35ctw Total Gemstone Weight

A substantial gemstone layout that gives the ring a luxurious, high-impact presence.

Half-Eternity Setting

Stones cover the front of the band for maximum visible sparkle while keeping the underside comfortable.

5mm Statement Profile

A bold width that works beautifully as a standalone ring, anniversary band, or colorful wedding band.

Crafted to Last. Guaranteed.

Every Luther’s Diamonds piece is handcrafted in our Atlanta studio. We include a Lifetime Craftsmanship Warranty for any manufacturing defect.

Learn More →

Up close

3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band, up close.

A bold half-eternity band designed with alternating oval blue sapphires and oval diamonds for rich color and brilliant contrast.

Metal
14K White Gold
Width
5mm
Made
By hand, to order

Happy wedding stories

Worn on the day.

More stories →
Kenneth

“Your team has been truly amazing with not only the service but the full dedication of making sure our rings captured the love we have for another.”

KennethAlexandrite & Ruby Wedding Bands

Uyen & Michael

“You guys made our dream wedding bands and it is everything we both wanted. We came this close 🤏to eloping because we did not want to take them…”

Uyen & MichaelCustom Contoured Wedding Bands

Andy

“The ring is everything I was expecting and more!! It turned out beautifully and I know my girlfriend is gonna love it.”

AndyCustom Pear Filigree Ring, Emerald & Opal

Ring Size Guide

US & Canada Ring Sizes

US Size Diameter (mm) Circumference (mm)
314.144.2
3.514.545.5
414.946.8
4.515.348.0
515.749.3
5.516.150.6
616.551.9
6.516.953.1
717.354.4
7.517.755.7
818.257.0
8.518.658.3
919.059.5
9.519.460.8
1019.862.1
10.520.263.4
1120.664.6
11.521.065.9
1221.467.2

UK & Australia Ring Sizes

UK Size Diameter (mm) Circumference (mm)
F14.144.2
G14.545.5
H14.946.8
I15.348.0
J15.749.3
K16.150.6
L16.551.9
M16.953.1
N17.354.4
O17.755.7
P18.257.0
Q18.658.3
R19.059.5
S19.460.8
T19.862.1
U20.263.4
V20.664.6
W21.065.9
X21.467.2

European Ring Sizes

EU Size Diameter (mm) Circumference (mm)
4414.144.2
4514.545.5
4614.946.8
4815.348.0
4915.749.3
5016.150.6
5216.551.9
5316.953.1
5417.354.4
5617.755.7
5718.257.0
5818.658.3
6019.059.5
6119.460.8
6219.862.1
6320.263.4
6520.664.6
6621.065.9
6721.467.2

Japanese Ring Sizes

JP Size Diameter (mm) Circumference (mm)
414.545.5
514.946.8
615.348.0
715.749.3
816.150.6
916.551.9
1016.953.1
1117.354.4
1217.755.7
1318.257.0
1418.658.3
1519.059.5
1619.460.8
1719.862.1
1820.263.4
1920.664.6
2021.065.9
2121.467.2

Find Your Ring Size

Measure Your Finger

Measuring finger for ring size
  1. Use a flexible measuring tape or length of string.
  2. Wrap it around the finger you'll wear your ring on. If you're creating a ring stack, consider where on your finger the ring will sit. If using string, mark the point on the string where the ends meet with a pen.
  3. Lay the string on a flat surface and use a ruler to measure the length (in inches or millimeters) up to the mark. Compare your measurement to the size chart to determine your ring size. If you are between sizes, opt for the larger size.

Measure an Existing Ring

Measuring ring diameter
  1. Choose a ring that already fits your finger well.
  2. Measure the interior diameter of the ring in millimeters (mm).
  3. Use the measurement chart to match the size of your ring to the closest size in mm. The interior of the ring should align with the outer edge of the circle.

Luther's At Your Service

There's no question too small or request too large for Luther's Diamonds client advisors. From choosing an engagement ring or gift to providing in-store or virtual appointments, we're always at your service.

3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm)

Up close

Color, all the way round

A line of color,
unbroken.

Each sapphire is matched to the next in tone and size, so the row reads as one continuous line of color, then set by hand in solid gold.

Half eternityhow far the stones go
5mmband width
3.35 cttotal gem weight

Build your stack

Wear it three ways.

3.35ctw Oval Blue Sapphire & Diamond Half-Eternity Band (5mm)Engagement ring and wedding band paired with this bandFull stack: engagement ring, wedding band and this band

The Lotus Lace oval echoes the oval sapphires. Two slim shanks keep the colored row prominent.

Styling preview · engagement ring shown at 2ct

From Our Workshop · Every Band By Hand

Watch how your band is made.

Every band is cast, shaped, set and polished by hand in our family studio. These are the stages yours passes through before it reaches your door.

Step 1

Grinding the Band

Once your band is cast in its rough form, every surface is ground down by hand to reveal its true shape and width: the same patient first step behind every ring that leaves our workshop.

1.50ctw Princess-Cut Channel-Set Half-Eternity Band
Step 2

Setting by Hand

Stones and Stone Inlay® are set one at a time, the metal worked around each by hand until it sits flush and secure. It's the slow part, and the part we never rush.

Hidden Blade Ring™
Step 3

Hand Polished

Every surface is polished inside and out through progressively finer abrasives, until the band feels smooth against the skin and catches the light evenly.

2.50ctw Princess Cut Channel-Set Eternity Band (4mm)
Step 4

The Finished Band

Checked for polish, comfort and every setting before it leaves the workshop, then shipped to you fully insured.

Birthstone Inlay Band Ring

Before you choose

Questions, answered.

Still wondering about something? Write to our family studio and Jack will answer personally. Ask us

Is it comfortable to wear every day?
Yes. Each stone is set low and close, and every edge is hand-polished smooth, so the band sits comfortably beside your engagement ring and doesn't catch on hair or knitwear.
How do I choose my size?
Pick your size in the options above. If you're unsure, open the ring size guide on this page to measure at home. Before we start making your band, we confirm the size with you, so it's right the first time.
What if my size changes later?
Write to us and we'll help. We'd much rather get it right from the start, which is why we confirm your size with you before your band goes into production.
How long does it take?
Every band is made to order by hand in our family studio. Most ship in about 4 weeks, fully insured, and we keep you updated along the way.
What does the warranty cover?
Every piece comes with our lifetime craftsmanship warranty against manufacturing defects. If a stone ever comes loose, we'll send you a replacement stone.