: Look for a vivid green or slightly bluish-green . The most valuable stones are medium to dark in tone; if a stone is too light, it may be classified as "green beryl" rather than emerald .
: Large emeralds are rare, so the price per carat often doubles as the weight increases . Authenticity and Certification Beginner's Guide to Buying an Emerald Gemstone buy emerald stone
: Natural emeralds almost always have visible inclusions called "jardin" (French for garden) . While expected, avoid stones with fractures that reach the surface, as they can impact durability . : Look for a vivid green or slightly bluish-green