uhh...what about peridot?
all the gems listed for virgos i've never heard associated as any of our virgo gems

Agate, in general is associated with Gemini, Virgos' Mercurial other. Virgoan agates tend to be green: Tree agate, green agate, and moss agate.

The healing properties of all three of these types of agates include helping with issues of self-confidence & self-esteem, digestion, and emotional diseases. Tree and Green Agate are purported to help with analytical abilities, while Moss Agate is associated with helping combate energy depletion, helping in concentration, perception, and analytical abilites, as well as tranformation of negative energy into positive.

Sapphire is associated with serenity, peace of mind, concentration, multidimensional cellular healing, chilling out overactive body systems, and helping relieve stress by focusing and calming the mind, releasing unwanted thoughts and mental tension and alleviating depression. Sapphire comes in a variety of colors, and Purple Sapphire is one of the colors also associated with Virgo. It has many of the same qualities as regular Sapphire in addition to being said to be a stone of awakening, helping deepen meditation, stimulating kundalini rising, and encouraging visionary qualities.

Green Zircon seems to be specific to Virgo, rather than regular Zircon. It is beneficial for synergy, constancy, illimination of jealousy & possessiveness by promoting unconditional love, and feelings of victimization. Helps in overcoming prejudice. Instills stamina and tenacity of purpose, as well as enhances clear thinking and seperates the significant from the insignificant.

Peridot is also associated with Virgo and considered beneficial for stress, lethargy, confidence, assertion, metabolism, the heart and intestinal tract and for digestive problems. It is said to release and neutralize toxins, purifying the subtle and physical bodies, and the mind. Also how to detach oneself from outside influences and to look to your own higher energies for guidance. It is said to particularly helpful to healers.

The above information is paraphrased or an excerpt from The Encyclopedia of Crystals by Judy Hall.