April's Birthstone is Diamond.
The diamond is a widely known stone with outstanding physical properties, in particular the qualities which originate from the bonding of its atoms. The result is that the diamond is recognized for its hardness (10 on Moh's Scale) and it's thermal conductivity.
Did you know a large and perfect (aka flawless and having no inclusions) diamond is called a paragon? A diamond with a weight of 12 carats held this title in the 16th century, but today, more than 99 carats are needed.
April's Alternate Birthstone is Quartz.
Quartz in it's purest form is called "Rock Crystal" or "Clear Quartz" because it is colorless and translucent.
Did you know the largest, recorded quartz crystal was 20 feet long and weighed more than 48 tons?
April's Birth Crystal is Cubic Zirconia.
Did you know that CZs are the biggest competitior against diamonds since production began in 1976?
Inclusions found in emeralds are considered part of their character, and used to assure the purchaser that the stone is natural. Such inclusions in most other gems are not acceptable.
Did you know that the emerald is one of the traditional four precious stones? The other three are ruby, diamond and sapphire.
Many precious gemstones are a form of chalcedony and include: Onyx, Avernturine, Agate, Mtorolite, Heliotrope, and Chrysoprase.