A standard
of AIDI

Three steps. Nothing invented.

1

Read

We read what a brand publishes about sustainability: reports, filings, product pages.

2

Check

For each statement, we look for someone independent who has checked it.

3

Record

We keep a dated copy of the page and mark the result. Every month.

Seven areas. Weighted as the index weighs them.

30Carbon & energy
15Water & chemicals
15People & labour
15Where it comes from
10Reuse & recycling
10Certificates & reports
5Nature
Checked by someone independentAn outside assurer, certifier, registry or regulator confirms it.
The brand's own reportShown with its own figures. Nobody outside has confirmed it.
Nothing foundWe looked, and found nothing public.

On a diamond. Lab-grown. The 4Cs, one published number, the record.

1

The stone

Shape, carat, colour, clarity, cut. Priced at the middle of what US retailers list today for lab-grown stones.

2

9.7%

What 20,000 consumers in 31 countries told PwC in 2024 they would pay extra for goods made sustainably.

3

The brand's share

Only areas checked by someone independent count, at the weights above. No checked product fact, nothing added.

Stone prices: The Diamond Price, Diamond Price Index, CC BY 4.0, snapshot 2026-10-02. Asking prices of loose GIA- or IGI-graded lab-grown diamonds, not sale prices. Colour and clarity are read together as a band, as the source does. Top: D–E, VVS1–FL · Premium: F, VS1–VVS2 · Mainstream: G–H, SI1–VS2. Lower grades, cuts below Very Good and shapes the source does not publish get no figure.

9.7% is what buyers say, across all goods, not what they paid for diamonds. Rules v4, frozen 2026-10-02, sha256 9e844fb047e4ed31. Rules file. Price table.

Not an appraisal. Not a grade. Not an offer. No brand can pay to change a result. Every line carries its date. The full method is on aidi.org.