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RING SIZE CONVERSION CHART BY FORMÉS 

FORMES Ring Size Guide

Finding your ring size should feel as effortless as slipping on your favorite piece. Whether you're choosing a gift or treating yourself, here's how to get the perfect fit at home.

1. Measure Your Finger

• Take a soft ribbon, string, or strip of paper and wrap it gently around your finger. Make sure it slides comfortably over your knuckle.

• Mark where it overlaps and measure the length in millimeters.

• That number is your finger’s circumference. For example, 54 mm means size EU 54.

Tip: If you're between sizes, go one size up. If you’re choosing a slim ring, you can opt for a slightly smaller size.

2. Measure a Ring You Already Own

• Pick a ring that fits the intended finger.

• Lay it flat and measure the inside diameter in millimeters across the widest point.

• Match this diameter to our size chart.

• Fingers on your dominant hand are usually a bit bigger.

• Warm weather = slightly larger fingers; cold = slightly smaller.

• Wide bands (6mm+) feel tighter—go half a size up.

• Slim stacking rings? Choose a snug fit.

Ring Size Conversion Chart

• Statement rings: If bold and wide, go half a size up.

• Stacking rings: Measure the exact finger and go for a snug fit.

• Knuckle/midi rings: These often run small—check specific design notes.

• Engagement and wedding bands: Precision matters. Measure carefully or contact us for help.

• Open rings: These are slightly adjustable but still follow our sizing guide.

Not sure which gold karat is right for you? Use the FORMÉS Gold Karat Cheat Sheet.

14 K Gold – Everyday Hero

• 58.5 % pure gold + 41.5 % strengthening alloys

• Light, modern hue (think champagne)

• Tougher surface: resists most scratches and dents

• Wallet-friendly and skin-friendly (nickel-free in our alloys)

• Best for: wedding bands, stackers, “never-take-it-off” pieces

18 K Gold – Heirloom Classic

• 75 % pure gold + 25 % lighter alloys

• Rich, saturated color (think late-sunset glow)

• Slightly softer; treat like a dress watch, not a tool watch

• Higher intrinsic value—and a bit more prestige

• Best for: milestone rings, statement pieces, future heirlooms

Quick Pick

• Wear it daily? Choose 14 K.

• Mark a big moment? Choose 18 K.

Whichever karat fits your rhythm, every FORMÉS piece is crafted from recycled gold and finished to the same exacting standards—sharp, balanced, intentional.

Your FORMÉS Diamond Guide

Let’s find the diamond that feels right—for your values, your story, and your light.

1. Natural or Lab Grown? Two Beautiful Journeys

At Formés, we request full energy-source info for every diamond we offer—transparency first.

2. The 4 C’s of Diamond Quality — Always the Standard

Both natural and lab grown diamonds are graded by the 4 Cs: Cut, Color, Clarity, and Carat. Here's what really matters:

• Cut = how it sparkles
  → We only use Excellent or Very Good. It’s the most important C, as it is not nature's given characteristic, but a polisher's expertise and craftsmanship.
• Color = how white it looks
  → We love the D–G range for its crisp, bright white look. While D–E diamonds are often chosen for investment, F–G diamonds offer the best balance of beauty and value—yellow tones are virtually invisible unless directly compared to D–E, so there’s no need to worry. When the design calls for it, warmer tones can be stunning too—these are often referred to as champagne, cognac, or even brown diamonds, and they bring character and a distinctive richness to the piece.
• Clarity = how clean it looks
  → We pick eye-clean diamonds. IF–VVS stand for no or almost no inclusions and are mostly chosen for investment; VS and SI1 are optimized for everyday wear. If you can’t see inclusions, they won’t matter.
• Carat = size and weight
  → Bigger isn’t always better. Let’s find your perfect proportion.

3. Choosing Your Diamond, Made Simple

💡 Fun fact: With lab grown, a clarity upgrade (e.g. VS to VVS) may only cost 5% more. In naturals, that could be 20% or more!

4. Diamond Certification — What to Look For

Every Formés stone comes with a trusted certificate and laser-inscribed ID.

5. Our Promise at Formés

• 💎 Single-origin only — One clear journey from source to setting
• ✨ Laser-inscribed — Every diamond is traceable by code
• 🌿 Recycled gold — All our 14K & 18K gold is responsibly sourced
• 📜 QR code in your box — See your diamond’s full story

Luxury is knowing your diamond’s past and future.

6. Fast FAQs

Will a lab-grown diamond keep its value?
Buy for love, not resale. Tech evolves fast—brilliance, responsibility and ethics are the real return.

Are natural diamonds always ethical?
Only when documented. We rely on trusted sources like GIA, SCS 007, and the Kimberley Process.

What matters more—cut or carat?
Always cut. A well-cut diamond will sparkle more than a larger one with poor cut.

At Formés, we don’t just set diamonds—we translate your light.
Choose natural or lab grown. Choose with heart. We’ll take care of the rest.

Moki 3 by Paysera lets you buy now and split the cost into 3 equal monthly payments over 3 months - 0% interest, no fees when paid on time. Available on all Formes purchases. Select Moki 3 at checkout and complete a quick agreement with Inbank. Eligibility and T&Cs apply.