33 definitions by ryan thompson

Cubic zirconia (sometimes called simply 'cz') is the most popular diamond simulant in the world today. It is an oxide of the metallic element zirconium, ZrO². It has a hardness of about 8.5 on the Mohs hardness scale, as opposed to diamond, which is 10, sapphire/ruby which is 9, topaz which is 8, and so on. The refractive index of CZ is 2.42. It can be made in nearly any color and can be faceted into many cuts.

CZ occurs naturally but in pieces too small for jewelry purposes. It wasn't until the 1970s however when Soviet scientists learned how to grow this mineral in the laboratory, at which time jewelry designers first took notice of cubic zirconia. For the first few years it was on the market it was often sold for as much as $20 per carat (!!) and was only available in a few colors.

CZ is more dense than diamond -- it weighs more for its size than diamond does. Sapphire and ruby, both of which are the same gemstone, just different colors, are also more dense than diamond. CZ is about 75% heavier than diamond. As such, a CZ's size is referred to in carats usually in comparison to diamonds. CZs are more accurately measured in millimeters, referring to the width of the stone. A 6.5 mm cubic zirconia is equal in size to a one-carat diamond and actually weighs about 1.75 carats.

CZ isn't grown/created like any other imitation gemstone in the world, either. A high radio-frequency "skull crucible" system is used, in which the melting zirconia powder actually creates the sides of its own container during its formation. Cooling this extremely hot molten ore becomes the most crucial step in the entire process. A carefully programmed cooling procedure is required to form the flawless crystals -- metal pipes in a coil-shape with water running through them are used to cool down the material, in the center.

When a black celebrity/athlete gets into trouble and his teamates/black commentators/BET media say he's "Keeping it real", as if it were assumed he is supposed to act like that. It is more or less a black-on-black racist term. (White people don't use the term and are largely unaware of what it means.) It says that black people are supposed to get in trouble with the law, thusly "keeping it real"; being true to their race.

A type of quasi-marriage some places (in the US) offer for gays and lesbians. Its marriage, but not quite marriage. It is like 'seperate but equal' in that it is inherently discriminatory.

A luxury car with a division window between the front and back seat, which can be raised and lowered by the occupants.

In America, limousines originally rolled off the assembly line as complete cars. They weren't super-stretched monsters. Around the late-1970s, early-1980s, companies began taking pre-existing cars (Cadillacs and Lincolns being the most popular choice) and stretching them by cutting them from one side to the other, between the front and rear doors, and 'filling in' in the middle.

A form of United States currency, specifically a Federal Reserve Note, which is the paper currency presently used by the United States. The ink on the reverse side of Federal Reserve Notes being green is what led to the nick name "greenback". To a lesser extent, Silver Certificates and United States Notes also had green backs, but the seal and serial numbers on the front were printed in blue instead of green ink. They were last issued in 1957 and 1966, respectively. Your parents probably remember them.

Sapphire is a type of corundum. It occurs in every color except red, because red corundum is ruby. It is actually more durable than diamond, even though diamond can't be scratched. Durability in this case refers to corundum's ability to withstand wear and tear.

Some sapphires grow in the earth in such a way that when they are cut cabochon style (which is basically a smooth, domed shape), they display a six-rayed star that moves around as the stone is moved around a fixed light source. This is refered to as "asterism".

A McDonalds restaurant character that has been retired for a while now. He had a hamburger for a head.