https://singullum.com/journal Notes on gemmology, provenance and the trade, written to be useful to someone deciding how to buy a stone. en-GB Fri, 11 Sep 2026 00:00:00 GMT https://singullum.com/journal/why-origin-moves-the-price https://singullum.com/journal/why-origin-moves-the-price How laboratories determine a coloured stone’s origin, why a Kashmir sapphire or Burmese ruby carries so large a premium, and where the opinion ends. Fri, 11 Sep 2026 00:00:00 GMT https://singullum.com/journal/buying-an-unheated-ruby https://singullum.com/journal/buying-an-unheated-ruby What heat does to a ruby, why an unheated ruby commands so large a premium, and what no indications of heating does and does not establish. Wed, 09 Sep 2026 00:00:00 GMT https://singullum.com/journal/what-the-kimberley-process-proves https://singullum.com/journal/what-the-kimberley-process-proves What the Kimberley Process covers, the three limits in its definition of a conflict diamond, why coloured stones fall outside it, and what to ask instead. Sat, 05 Sep 2026 00:00:00 GMT https://singullum.com/journal/how-to-read-a-gemstone-report https://singullum.com/journal/how-to-read-a-gemstone-report A practical guide to gemstone reports from GIA, SSEF, Gübelin and AGL: species, treatment disclosure, origin, and how to verify one is genuine. Thu, 03 Sep 2026 00:00:00 GMT https://singullum.com/journal/one-of-a-kind-bespoke-or-limited-edition https://singullum.com/journal/one-of-a-kind-bespoke-or-limited-edition What one of a kind, bespoke, made to order and limited edition mean in fine jewellery, and the questions to ask a house before you buy. Thu, 27 Aug 2026 00:00:00 GMT https://singullum.com/journal/reading-inclusions-in-a-gemstone https://singullum.com/journal/reading-inclusions-in-a-gemstone What inclusions in a gemstone are, why a jardin in an emerald or silk in a sapphire can raise its value, and how they prove a stone is natural. Wed, 19 Aug 2026 00:00:00 GMT