Inspired by a cluster theme, this Boyaca Colombian emerald and natural white zircon pendant necklace is designed to become a magical delight in your ornamental collection. Smooth-cut emerald accents are set closely to resemble a cluster. The natural white zircon adornments in between add remarkable luster to the pendant. In a cluster setting, smaller gems are set closely together to resemble a larger gem. A cluster pendant can contain a large center stone or a group of stones of equal size. Boyaca Colombian Emerald Facts​​ Colombian emerald ranks 7.5-8 on the Mohs scale of hardness. This variety of emeralds is known for its yellow-green to blue-green hues. The bail is fascinatingly adorned with zircon accents. This matinee necklace is crafted in platinum-plated sterling silver.