I have a sapphire pendant necklace that came with a certificate from something called the AGTA. Is this a reliable gemological institution?

What physical properties do garnet gemstones posses?

I once saw on TV that emeralds are more expensive than diamonds. Is this really true?

Is there such a thing as conflict emeralds or conflict rubies?

How can I keep my gemstones from falling off of my diamond engagement ring?

Are pearls considered a precious gemstone?

What does it mean that a Tanzanite ring has an Opal Inlay?

What do the different birthstone colors symbolize? I was considering buying my girlfriend a pendant set entirely with birthstones and was wondering which color birthstones should I combine. What do the different colors mean?

What is an ammolite gemstone? What are some of its physical and metaphysical properties?

I have some opal set jewelry, how do I care for this birthstone?