Emeralds that range from a vivid bluish green to pure green are considered the best. Emeralds can appear more yellow-green, extremely dark forest-green, and even pale green, and ultimately the shade you prefer is a totally personal choice. Emeralds, like most coloured gemstones, can contain ‘colour zoning’ - this is where the colour appears more intense in some areas, and weaker in others, creating an inconsistently coloured stone: choose an emerald with no visible colour zoning. Ultimately, the shade of emerald green that works for you the most is a totally personal choice.