![Oval lab diamond carat size comparison on the hand [ld all] [ld look=oval]](http://luthersdiamonds.com/cdn/shop/files/IMG_2817.png?v=1782674265&width=1100)
![Oval lab diamond carat size comparison on the hand [ld all] [ld look=oval]](http://luthersdiamonds.com/cdn/shop/files/IMG_2817.png?v=1782674265&width=1080)
![Oval lab diamond carat size comparison on the hand [ld all] [ld look=oval]](http://luthersdiamonds.com/cdn/shop/files/IMG_2817_1800x1800.png?v=1782674265)
The Classic Six
Handcrafted by our family workshop · Made to order
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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.
If your size ever changes, our family team will walk you through the options, but a ring built in your size from day one always wears best.
Engraving & Stone Inlay®: what's included?
Both are on us. Engraving: up to 9 characters, spaces included (like “J&A 2027”). Your handwriting is free too. A custom font or placement is $75, since it needs its own CAD.
Stone Inlay®: two small birthstones set into your band, often yours and theirs.
Will I see my diamond before it's set?
Yes, on every order. Within 24 hours we send a video of your exact diamond and its IGI report (DEF color, VS2+ clarity). Approve it, and that's the stone we set. Prefer natural? Request a natural diamond.
Is it ethically sourced?
Yes. Your diamond is lab-grown, never mined, and so is every accent diamond on this piece. You don't have to take our word for it:
- Your IGI report states “laboratory-grown” in writing.
- The report number is laser-inscribed on your diamond, so you can look it up on IGI's website and match it to your stone.
- Before we set it, we send you a video of that exact diamond.
Prefer a natural diamond? We source them only from suppliers whose invoices carry a Kimberley Process and System of Warranties statement. Request a natural diamond
Adding Stone Inlay®? Those birthstones vary: some are lab-grown and some are natural. Just ask about yours.
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.
Timeless, refined, and effortlessly precise.
A oval diamond is secured by six graceful prongs, designed to maximize light while maintaining a perfectly balanced silhouette.
Set on a slender solid gold band, the focus remains exactly where it should be — on the diamond.
Pure simplicity, executed without compromise.
Material
14K Solid Gold or Platinum 950
Main Stone
Diamond
Band Width
Stone
The Luther’s Standard
Every diamond we set passes the same non-negotiable bar — before it's ever offered to you.
- D · E · F Color — Colorless. The top grade tier, no yellow tint or brown undertone.
- VS2+ Clarity — Eye-clean. No inclusions visible to the naked eye, ever.
- Triple Excellent Cut — EX cut, EX polish, EX symmetry. All three, always.
- IGI Certified — Independently verified, with a unique certificate for your exact stone.
Every stone passes all four. Or it doesn't ship.
You see your diamond before we set it.
Every order — not just upon request
Within 24 hours of checkout you'll receive a video of your exact stone filmed in our vault, along with your IGI certificate. Approve, and we set your ring.
- You place your order — Choose your setting, metal, and complete checkout. We get to work straight away.
- We email you within 24 hours — A video of your exact diamond, plus your IGI PDF certificate. Your stone, not a stock example.
- You approve. We set. — Happy with what you see? Give us the go-ahead and we set your ring. It arrives in about 4–5 weeks from your order.
(A sample IGI certificate is shown below — yours will be unique to your stone.)
Interested in this setting with a natural diamond?
Elevate this design with a hand-selected natural diamond — chosen for its character, brilliance, and rarity.
Our team will source options tailored to your exact preferences and walk you through each one.
Built to Last. Backed for Life.
Every Luther's Diamonds ring is handcrafted in our Atlanta studio, using only the finest metals and ethically sourced stones. We stand behind our craftsmanship for life — if it leaves our studio, we stand behind it.
Ring Size Guide
US & Canada Ring Sizes
| US Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 3 | 14.1 | 44.2 |
| 3.5 | 14.5 | 45.5 |
| 4 | 14.9 | 46.8 |
| 4.5 | 15.3 | 48.0 |
| 5 | 15.7 | 49.3 |
| 5.5 | 16.1 | 50.6 |
| 6 | 16.5 | 51.9 |
| 6.5 | 16.9 | 53.1 |
| 7 | 17.3 | 54.4 |
| 7.5 | 17.7 | 55.7 |
| 8 | 18.2 | 57.0 |
| 8.5 | 18.6 | 58.3 |
| 9 | 19.0 | 59.5 |
| 9.5 | 19.4 | 60.8 |
| 10 | 19.8 | 62.1 |
| 10.5 | 20.2 | 63.4 |
| 11 | 20.6 | 64.6 |
| 11.5 | 21.0 | 65.9 |
| 12 | 21.4 | 67.2 |
UK & Australia Ring Sizes
| UK Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| F | 14.1 | 44.2 |
| G | 14.5 | 45.5 |
| H | 14.9 | 46.8 |
| I | 15.3 | 48.0 |
| J | 15.7 | 49.3 |
| K | 16.1 | 50.6 |
| L | 16.5 | 51.9 |
| M | 16.9 | 53.1 |
| N | 17.3 | 54.4 |
| O | 17.7 | 55.7 |
| P | 18.2 | 57.0 |
| Q | 18.6 | 58.3 |
| R | 19.0 | 59.5 |
| S | 19.4 | 60.8 |
| T | 19.8 | 62.1 |
| U | 20.2 | 63.4 |
| V | 20.6 | 64.6 |
| W | 21.0 | 65.9 |
| X | 21.4 | 67.2 |
European Ring Sizes
| EU Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 44 | 14.1 | 44.2 |
| 45 | 14.5 | 45.5 |
| 46 | 14.9 | 46.8 |
| 48 | 15.3 | 48.0 |
| 49 | 15.7 | 49.3 |
| 50 | 16.1 | 50.6 |
| 52 | 16.5 | 51.9 |
| 53 | 16.9 | 53.1 |
| 54 | 17.3 | 54.4 |
| 56 | 17.7 | 55.7 |
| 57 | 18.2 | 57.0 |
| 58 | 18.6 | 58.3 |
| 60 | 19.0 | 59.5 |
| 61 | 19.4 | 60.8 |
| 62 | 19.8 | 62.1 |
| 63 | 20.2 | 63.4 |
| 65 | 20.6 | 64.6 |
| 66 | 21.0 | 65.9 |
| 67 | 21.4 | 67.2 |
Japanese Ring Sizes
| JP Size | Diameter (mm) | Circumference (mm) |
|---|---|---|
| 4 | 14.5 | 45.5 |
| 5 | 14.9 | 46.8 |
| 6 | 15.3 | 48.0 |
| 7 | 15.7 | 49.3 |
| 8 | 16.1 | 50.6 |
| 9 | 16.5 | 51.9 |
| 10 | 16.9 | 53.1 |
| 11 | 17.3 | 54.4 |
| 12 | 17.7 | 55.7 |
| 13 | 18.2 | 57.0 |
| 14 | 18.6 | 58.3 |
| 15 | 19.0 | 59.5 |
| 16 | 19.4 | 60.8 |
| 17 | 19.8 | 62.1 |
| 18 | 20.2 | 63.4 |
| 19 | 20.6 | 64.6 |
| 20 | 21.0 | 65.9 |
| 21 | 21.4 | 67.2 |
Find Your Ring Size
Measure Your Finger
- Use a flexible measuring tape or length of string.
- 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.
- 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
- Choose a ring that already fits your finger well.
- Measure the interior diameter of the ring in millimeters (mm).
- 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.
Every order, not on request
You see your diamond before we set it
- 1 You chooseYour setting, carat and gold.
- 2 You see itA video of your exact diamond and its IGI report, within 24 hours.
- 3 We set itApprove it, and we set your ring by hand.
DEF color · VS2+ clarity · IGI certified
Postcards from our couples
Real rings, real people, shared with their permission.
