This is a small lot of Burma Ruby we purchased at a gem show late in the 1990's. The thing I found attractive was the fluorescence of the color (and the price).
GIA Type 2 Clarity Chart
VVS Very Very Slightly Included - Minor inclusions
VS Very Slightly Included - Noticeable to Minor
SI1 Slightly Included - Noticeable to OBVIOUS
SI2 Slightly Included 2 - Obvious to Prominent
I1 Included 1 - Prominent - moderate effect on appearance or durability
I2 Included 2 - Prominent - severe effect on appearance & durability
I3 Included 3 - Prominent - severe effect on beauty, transparency & durability
Type 2 Colored Gemstones by their nature have natural inclusions. (Inclusions are the norm) This includes gems such as Andalusite, Crysoberyl, Alexandrite, Corundum (i.e. Sapphire and Ruby), Garnet, Peridot, Quartz, Amethyst, Citrine, Ametrine, Spinel, Tourmaline and Zircon.
This gemstone (or gemstone that is part of this piece of gemstone jewelry) has been enhanced by traditional heat treatment. Traditional heat treatment is used to improve a stones color, remove color zoning/banding, and improve clarity. This treatment is considered permanent. The only way to tell if a colored stone has been treated is for the stone to be analyzed by a lab. Generally only gemstone laboratories have the equipment necessary to make a qualified judgement with any certainty.
Untreated gemstones are rare and should be verified by a lab independent of the seller. A good rule of thumb is to always assume a gemstone has been enhanced, unless valid certification from a reputable laboratory is available. No one that sells jewelry or gems should be doing appraisals, certifications, or analysis. It should always be an independent third party with no vested interest in the sale.