The Diamonds Tester Journal

Learn before you buy

Straight-talking guides on diamond authenticity, value and the tests that actually work — written by the gemologists behind every verdict.

Cut, colour, clarity and carat — explained in plain English, with the trade-offs that quietly save (or cost) you the most money.

May 12, 2026 · 7 min read

Conflict diamonds, the Kimberley Process and its blind spots, recycled stones, and how lab-grown fits into an honest ethical choice.

April 3, 2026 · 7 min read

Round, oval, emerald, cushion and beyond — how each shape sparkles, hides colour and inclusions, and what it does to the price.

March 10, 2026 · 8 min read

Reading is good. Certainty is better.

Put what you’ve learned to work — get a clear verdict on your own stone in minutes.