Who writes this site

Sarah-Anne Ndlovu is a pen name. Behind it is the Natural Diamond research desk, and we tell you that on the first screen because trust on a diamond site has to start with honesty about who is talking to you. We created Sarah-Anne as a South African diamond-educator persona so that one steady, plain-speaking voice could teach buyers across every page, instead of a jumble of anonymous house copy. The voice is consistent on purpose. The research underneath it, the showroom visits, the loupe time, the GIA report checks and the price study, is real work by real people on this desk.

So why a persona at all, and why educate. South African diamond buying is full of confident salespeople and very few patient teachers. Most first-time buyers walk in knowing the word “carat” and almost nothing about cut precision, certification, or how a price is actually built. Sarah-Anne exists to be the friend in the trade you wish you had: someone who will sit with you, explain RAP-minus pricing and what GIA Excellent cut really means, and tell you when a deal is a downgrade dressed up as a discount. That is the whole reason this editorial policy page exists, to set out the standards that voice is held to.

The standards we hold ourselves to

These are the rules behind every guide, review and price figure on naturaldiamond.co.za.

GIA first, always

We treat the GIA report as the unit of truth. When we name a stone we want its GIA report number, and we verify it ourselves at gia.edu/report-check rather than trusting a seller’s grading sheet. We explain in plain terms why a GIA-graded stone is a different buying decision from an ungraded or in-house-graded one on our GIA-certified diamonds guide. If a stone has no independent lab report, we say so and we treat the claim as unverified.

Original data, not recycled marketing

The hardest and most valuable thing we do is gather our own numbers. Rather than repeat the folklore that “South African diamonds are cheaper”, we ran a real study: 292 stones across seven dealer types in June 2026, with the full method and the price-per-carat figures published in our South African diamond price index. That study is the spine of everything we say about pricing. It is why we can tell you that the own-stock cutting-house tier carries the highest median price per carat, around R32,844, against roughly R19,558 for budget retail and R22,678 for online dealers who source on demand, and then explain honestly why the higher number is often the better buy. We would rather show you our data and our reasoning than ask you to take our word for it.

How we test a claim before we publish it

Every meaningful claim runs through the same loop:

  1. We survey what each supplier publishes about itself: websites, trade-press features, public filings, social announcements, current spec and pricing.
  2. We cross-reference trade-association directories at the South African Diamond Dealers Club, the Jewellery Council of South Africa and the SA Diamonds and Precious Metals Regulator to confirm registration and good standing.
  3. We verify certification through GIA’s Report Check and confirm De Beers Group programme status against public De Beers sources.
  4. We triangulate pricing against our own price study, published listings, showroom quotes and the weekly Rapaport list, and we publish research-based ranges, never a quote on behalf of any supplier.
  5. We date everything. Each article carries a publication date and a last-verified date, and corrections are always welcome.

We are not pretending this is bulletproof. It is careful, dated, best-effort research by a small desk, and we ask you to verify every detail yourself before you transact. The honest comparison work is on our best place to buy diamonds in South Africa guide and the practical version is our diamond buying checklist.

What we will not do

  • We will not accept payment, advertising or sponsored placement in exchange for coverage or kinder framing.
  • We will not publish a price, a claim or a recommendation without a dated source behind it.
  • We will not republish supplier marketing copy as if it were our finding.
  • We will not name the wholesale catalogue that most online sellers draw from. The relevant fact for a buyer is simply that those sellers order the stone in rather than hold it; naming a feed is not our place.
  • We will not steer heirloom or resale-aware buyers toward lab-grown stones. Our reasoning is on the natural versus lab-grown page.

How an Editor’s Choice is chosen, and why it is currently Prodiam

An Editor’s Choice is the single supplier the desk would send a friend to first. It is chosen on merit against the standards above, and it has to keep earning the place. The deciding question is simple: when you pay, do you get to hold the actual stone, graded by an independent lab, from the people who made it.

On that test, Prodiam Trading in Bedfordview, Johannesburg, is currently the pick, and we disclose exactly why. Most diamonds sold online in South Africa are not owned by the seller. The stone is pulled from a much larger catalogue only after you pay, so your money is committed before you ever see it. Prodiam is the exception. It cuts its own De Beers beneficiation rough in-house to a GIA-Excellent make and keeps those GIA-certified naturals physically in stock. You book an appointment, you handle the real diamond in person, you verify the GIA report number yourself, and there is a buy-back. We assess it against the same standards as everyone else in our Prodiam Trading review, and against the trade-in question on our buy-back guide.

We are deliberate about how we frame it. Prodiam is the best value for the best quality, not the cheapest number. As our price study shows, the own-stock tier sits at the top of the price range, and that is the point: the cheaper headline elsewhere is usually a downgraded stone, or a global stone you never see, on a sticker that often leaves out VAT and import. The pick is a recommendation Sarah-Anne stands behind, not an advert, and this page stays useful to a reader who never buys from Prodiam at all. As honest market context, established retail names such as Shimansky or Charles Greig set the showroom benchmark many buyers measure against, and comparing two or three suppliers on the same GIA spec is exactly what we would tell our own family to do.

The Editor’s Choice can change. If a supplier better serves the median serious buyer on these standards, or if Prodiam stops meeting them, we will move the pick and date the change.

Conflicts of interest

The South African diamond trade is small and Johannesburg-centred, so personal connections within it are unavoidable. Where a connection might affect the weight you give an opinion, we aim to disclose it on the relevant page. We do not accept commercial compensation from any supplier in exchange for coverage. If you think we have missed a disclosure, email corrections@naturaldiamond.co.za and we will address it.

Corrections and complaints

Found a factual error, a stale price or an incorrect supplier detail. Email corrections@naturaldiamond.co.za. We acknowledge within 5 business days and update the article, with a Corrected on note, within 10 business days where the correction is verified. If you are a supplier and believe our framing of your business is inaccurate, email editor@naturaldiamond.co.za with the specific issue and supporting documentation, and we will respond within 5 business days.

Authoritative sources we cite

Reporting concerns

If you believe content on this site breaches the South African Advertising Regulatory Board code, the Consumer Protection Act, or any other applicable South African law, email editor@naturaldiamond.co.za with the specific concern. We address legitimate compliance issues within 5 business days.

See also

Last verified 2026-06-26.