Jewellery design & appraisal · first model free
Upload a photo or a certificate. Get the construction as editable CAD, a gem report, the metal weight for every karat, and a price that separates natural from lab-grown, retail from resale, and shows where every number comes from. Today's gold price is right here.
Upload jewellery photos and get a parametric 3D model: band, setting, prongs, stones, chain links. Change metal and stones, estimate gold weight, export STL.
An AI jeweller that edits parametric 3D jewellery: change karat and colour, resize stones, add halos and pavé, engrave text, create matching pieces. Photoreal renders.
Upload a photo or certificate of any jewellery and get a full price estimate: metal at today's spot, stones by size and grade, making cost, margins and VAT for your country, for new, pre-owned or to-be-made, natural or lab-grown.
An AI jewellery appraisal in a minute: upload photos, a certificate or an old appraisal and get a spec sheet (metal, stones, sizes, carats) and a transparent price estimate for your country. Not a legal appraisal, and honest about it.
Calculate a diamond ring's value from a photo or certificate: centre stone carat and grade, metal weight and karat at today's spot, making cost, VAT. Natural or lab-grown, resale and scrap included.
Price a lab-grown diamond ring or any piece next to its natural equivalent: per-carat tables for both, setting and making cost, VAT, and the resale value of each. One tap switches origin.
9K to 24K in 25 currencies, refreshed daily; what a ring, chain or bangle is worth in metal.
Calculate gold weight from real modelled volume × alloy density for 10K, 14K, 18K, 21K and 22K, with today’s gold price per gram in 25 currencies.
Design jewellery with a free AI: start from a photo or the demo ring, change stones, metal, setting and size by talking, see the gold weight and a price. First complete model free, edits always free.
Engagement rings, halos, bands, eternity rings, tennis bracelets, pendants, chains, bangles, earrings, signets.
Every karat, in USD; the full tables cover 25 currencies. The same figures price the metal inside every estimate.
| Karat | Hallmark | Purity | USD per gram | per 10 g |
|---|---|---|---|---|
| 9K | 375 | 37.5% | $52.93 | $529.29 |
| 10K | 417 | 41.7% | $58.86 | $588.57 |
| 14K | 585 | 58.5% | $82.57 | $825.70 |
| 18K | 750 | 75.0% | $105.86 | $1,058.59 |
| 21K | 875 | 87.5% | $123.50 | $1,235.02 |
| 22K | 916 | 91.6% | $129.29 | $1,292.89 |
| 24K | 999 | 99.9% | $141.00 | $1,410.04 |
Spot $4,390.10 per troy ounce ($141.15 per gram of pure gold) from gold-api.com, Fri, 18 Sep 2026 06:15:08 UTC; exchange rates from open.er-api.com. Refreshed daily. Per-gram figures are pure gold price × karat purity; dealers buy and sell a few percent either side.
How lab-grown and natural diamonds are priced, why the gap keeps widening, what each is worth second-hand, and how to tell them apart with a certificate.
Where a jewellery price comes from, line by line: gold at spot, stones by size and grade, workshop hours, wholesale and retail margins, brand, and VAT per country.
How to read the tiny numbers inside a ring: 375 is 9K, 585 is 14K, 750 is 18K, 916 is 22K. What each is worth per gram today and how to check a piece with no mark.
What a diamond grading report contains, how GIA, IGI and HRD differ, why a GIA report adds a premium on natural stones and why IGI is standard for lab-grown.
The three numbers for used jewellery: scrap value, dealer buy-back and private sale. How each is calculated, why stones come back at a third, and how to get more.
Three ways to measure a ring size at home, a conversion chart between mm, US, UK and EU sizes, and why the size changes an eternity ring's stone count and a band's weight.
VAT and sales tax rates on jewellery in 40 countries, from 0% in Hong Kong to 25% in Scandinavia, plus India's 3% GST and how US sales tax works.
What a jeweller charges to make a ring from your design: casting, setting, finishing, CAD and plating hours at workshop rates from India to Switzerland, plus materials.
Professional jewellery CAD (MatrixGold, RhinoGold, JewelCAD) is powerful and takes months to learn. Kubikly builds a parametric model from a photo and edits it by talking, with gold weight and price built in.
Online appraisal services give you a written valuation by a person in days for a fee. Kubikly gives a transparent, line-by-line price estimate in a minute, for new, pre-owned or to-be-made, natural or lab-grown, in your country.
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