For the new gem buyer, terms like “VSI” and “eye clean” may be confusing. Below are the definitions mandicollection.com use to describe Gem Clarity:

Clean – Gems that are free from inclusions.

Eye Clean – Gems that are clean to the naked eye.

Crystal Transparent – These gems are transparent and have excellent brilliance. They might have some minor inclusions, common to that particular gem type, but these do not deter from the rarity and beauty of the gem. The word “crystal” is commonly used in all major global gemstone sources.

VSI (very slight inclusions) – While these gems have some small inclusions, they will not diminish the brilliance and beauty of the gem when set

SI (slight inclusions) – These gems have some inclusions visible to the naked eye but not to the extent of affecting the brilliance of the gem.

Included/PK (Pique) – These gems have some larger and/or many minor inclusions that somewhat diminish the brilliance of the gem.

Transparent – Transparent gems allow light to pass through them without diffusing (scattering) the light.

Translucent – Translucent gems allow light to pass through them, but the light is somewhat diffused (scattered).