Gemstones
A practical checklist for UK buyers to tell natural turquoise from dyed howlite, resin blocks and other imitations before parting with money.
A practical guide to three British gemstones — Derbyshire's Blue John, Whitby jet and Cornish serpentine — covering their history,...
Rough and cut gemstones suit different collectors. Here is how value, risk, display and UK buying practicalities compare, and how to...