Gemstones

From Whitby jet to Cornish serpentine and Derbyshire's Blue John, a practical guide to the British Isles' native gem materials, their...

The Mohs scale ranks minerals by scratch resistance. Here's what those numbers mean for everyday wear, cleaning and storing your...

Learn how colour, transparency and lustre can help you recognise popular gemstones, with practical home tests, common lookalikes, and...