All gemstones
A field guide to 30 gemstones — identification, care, value, and meaning. Each profile opens with a grading card (category, Mohs hardness, birthstone, major sources, luster, care level) and continues with seven short sections.
Precious gemstones
Semi-precious gemstones
AmethystFebruary · Mohs 7AquamarineMarch · Mohs 8GarnetJanuary · Mohs 7PeridotAugust · Mohs 7OpalOctober · Mohs 6TopazNovember · Mohs 8TurquoiseDecember · Mohs 6CitrineNovember · Mohs 7AlexandriteJune · Mohs 8MoonstoneJune · Mohs 6TanzaniteDecember · Mohs 6ZirconDecember · Mohs 7JadeMohs 7Lapis LazuliSeptember · Mohs 5OnyxMohs 7SpinelAugust · Mohs 8TourmalineOctober · Mohs 7KunziteMohs 7MorganiteMohs 8MalachiteMohs 4RhodochrositeMohs 4BloodstoneMarch · Mohs 7AgateMohs 7ChalcedonyMohs 7