The Gemmology Journal

Opals_Ministry of Gems
Black Opal: Australia's Rarest Treasure
Black opal — found only at Lightning Ridge — is the world's rarest and most valuable opal. Our FGAA gemmologist explains what makes it special and how to choose one. Read more...
Padparadscha Sapphires_Ministry of Gems
Padparadscha Sapphires: The Rare Pink-Orange Sapphire
The padparadscha — a rare pink-orange sapphire with Ceylon roots — is one of the fastest-rising gems of 2026. Our FGAA gemmologist explains why, and how to choose one. Read more...
Teal Sapphire Ring_Ministry of Gems
Teal Sapphires: The Modern Engagement-Ring Trend
Teal sapphires — a moody blue-green — are one of 2026's biggest engagement-ring trends. Our FGAA gemmologist explains why, where they come from, and how to choose one. Read more...
Gemstones_Ministry of Gems
Lab-Grown vs Natural Sapphires: What's the Difference?
Lab-grown sapphires look similar but differ hugely in rarity, value and meaning. Our FGAA gemmologist explains the difference — and how to know what you are buying. Read more...
FGAA Gemmologist_Ministry of Gems
What Is an FGAA Gemmologist? (And Why It Matters)
FGAA stands for Fellow of the Gemmological Association of Australia. Learn what a qualified gemmologist actually does, and why buying from one protects you. Read more...
Gemstones_Ministry of Gems
Birthstones by Month: A Complete Guide
What's your birthstone? Our complete month-by-month guide covers every birthstone's meaning — including September's sapphire and October's opal. Read more...
Australian Opals_Ministry of Gems
How to Buy Opals: A Complete Buyer's Guide
Buying an opal? Our FGAA gemmologist explains opal types, play-of-colour, value and what to look for so you choose a stone you will love. Read more...
Australian Parti Sapphires_Ministry of Gems
Parti Sapphires: Australia's Unique Two-Tone Gems
Parti sapphires blend two or more colours in a single natural stone. Discover these rare, uniquely Australian gems and why no two are ever alike. Read more...
Ceylon Sapphires_Ministry of Gems
Sapphire Engagement Rings: A Buyer's Guide
Thinking of a sapphire engagement ring? Our FGAA gemmologist covers colours, settings, durability and budget so you can choose with confidence. Read more...
Australian Opal_Ministry of Gems
Caring for Opals: How to Keep Your Opal Beautiful
Opals are captivating but a little delicate. Our FGAA gemmologist shares how to clean, store and wear your opal so it stays brilliant for a lifetime. Read more...
Ceylon Blue Sapphires_Ministry of Gems
How to Choose a Sapphire: A Buyer's Guide
Colour, clarity, cut, carat, origin and treatment — our FGAA gemmologist explains how to choose a sapphire with confidence, whether for an engagement ring or a special gift. Read more...
Ceylon Sapphires_Ministry of Gems
What Does 'Unheated' Sapphire Mean? (And Why It Matters)
'Unheated' sapphires are natural and untreated — and prized for it. Our FGAA gemmologist explains heat treatment, why unheated stones cost more, and how to be sure what you're buying. Read more...
Ceylon & Australian Sapphires_Ministry of Gems
Ceylon vs Australian Sapphires: What's the Difference?
Ceylon and Australian sapphires both dazzle — but they differ in colour, origin and value. Our in-house FGAA gemmologist explains how to tell them apart and choose the right stone... Read more...