Turquoise is porous, and it absorbs whatever it spends time pressed against. Skin oils, sweat, hand cream, perfume and plain […]

Your malachite is dull because the polish has been chemically attacked, and malachite is unusually easy to attack. It is

A crystal goes cloudy for one of five reasons, and only three of them can be undone. The reversible ones

There are four physical routes a crystal takes to black, and which one applies depends entirely on the stone. Iron

Short answer: moisture. Selenite is gypsum — calcium sulfate dihydrate, CaSO₄·2H₂O — and gypsum genuinely dissolves in water, at around

Four things turn rose quartz white, and they are nowhere near equally likely. The surface can be scuffed to a

If you are holding a stone and deciding whether to put it on the windowsill, the short answer is: amethyst,

Short answer: light did it. Amethyst gets its purple from iron atoms that were rearranged into “colour centres” by millions

If you’re wondering where to buy genuine crystals, your most reliable options are reputable mineral and gem shops, certified gem

Can experts tell fake crystals instantly? Often, yes — an experienced gemologist can frequently spot an obvious fake (dyed glass,