How much does a lab-grown diamond engagement ring cost in Europe vs the US in 2026?

• US prices are shown before sales tax. Sales tax is added at checkout and depends on where the ring is delivered. The Tax Foundation puts the population-weighted average combined state and local rate at 7.53% as of mid-2026, and five states (Alaska, Delaware, Montana, New Hampshire, Oregon) have no statewide sales tax (Tax Foundation, 6 July 2026). So a $4,000 ring costs about $4,300 at the average rate.
• European prices include VAT. By law, an EU shop shows consumers the price with VAT in it. Kove’s euro prices, and the figures in our price index, include Czech VAT (21%). Subtracting 21% from a European price is not a fair way to compare, and it is not what a US buyer pays either: see the next point.
• A ring shipped from the EU to the US leaves EU VAT behind, and meets US import duty. Goods dispatched outside the EU are exempt from EU VAT under Article 146 of the EU VAT Directive (Directive 2006/112/EC). On the US side, the duty-free threshold for small parcels (de minimis, $800) no longer applies to these parcels: it was suspended for all countries from 29 August 2025 (Executive Order of 30 July 2025; CBP, 29 August 2025). US tariffs on EU goods also changed several times in 2026. That is why we do not print a duty rate on this page: we quote it per order, on the day, in writing.
• Exchange rate. Kove prices are in euros and a US card pays in euros; your bank converts at its own rate and may add a foreign transaction fee. The dollar figures on this page are approximate conversions at the European Central Bank reference rate of 1 EUR = 1.1214 USD on 10 November 2026 (ECB), not prices.

On 1 July 2026 we measured every IGI- or GIA-certified lab-grown stone our configurator draws on, color D-H, clarity VS2 or better, and published the median by carat band. Full method, natural-diamond figures and stone counts: Lab-Grown Diamond Price Index, July 2026.

*Approximate conversion at the ECB rate of 1.1214 on 10 November 2026, not a price. The euro figures are from 1 July 2026; wholesale lab-grown prices kept moving after that (see the JCK figures above), so treat them as a dated snapshot. A finished ring adds the gold setting.

Put two quotes side by side only when every line below matches, or when you know what the difference is worth.

1. Carat. The exact weight, not "about 1 carat". Prices step up at 1.00, 1.50 and 2.00 ct; a 0.95 ct and a 1.02 ct stone are priced differently.
2. Color and clarity. The grades on the report, for example G / VS1. A "D-K" or "near colorless" range is not a grade.
3. Cut and shape. Cut grade for rounds; for ovals and other fancy shapes, look at proportions and the report. More in our 4Cs guide.
4. Certificate. IGI or GIA, with the report number you can check online before paying. "Certified" without a named lab and number tells you little.
5. Metal. 14K vs 18K, and the gold weight. Gold is priced by weight at the daily rate; a heavier band costs more.
6. What the price includes. Sales tax or VAT, shipping, insurance, import duty, engraving, resizing. Write each one down as included, extra, or unknown.
7. Final total in your currency. For a ring from Europe: the written delivered price, then your bank’s conversion and any foreign transaction fee.

• The delivered price, in writing, before you pay. Ordering to the US? Write to us before you pay: we confirm in writing the full delivered price to your address, including US import duty, for your exact ring. That written figure is the one to put next to a US jeweler’s price plus sales tax.
• Production. Every ring is made to order to our drawings in our partner atelier, in up to 21 business days, often sooner. Inspection and finishing are done by us before dispatch.
• Delivery time to the US. We do not have our own measured figure for US transit and customs clearance yet, so we do not print one. Tell us your proposal date and we will confirm before you order whether it can be met.
• Ring size. We make rings to the EU (ISO) scale in millimeters of inner circumference. A US size 6 is about EU 52 (16.6 mm, 0.65 in inner diameter); US 6¾ is about EU 54. Conversion chart and secret-sizing methods: ring size guide.
• If it does not fit, or you change your mind. A made-to-order ring cannot be returned for a change of mind. The first resize is free within 60 days of delivery; for a US address, shipping both ways and any import charges are yours, and we tell you the amount before you send it. Defects are covered by the 24-month warranty. Full text: return policy.
• What you can check yourself. Kove Jewelry s.r.o., company ID 27484611, Czech business register; registered with the Czech Assay Office under No. 15 432. Every center diamond over 0.30 ct comes with an IGI or GIA report, its number laser-inscribed on the stone.