what is a white sapphire
A white sapphire is a completely colorless sapphire. No trace elements are present and it is sometimes used as an alternative to diamonds.
is a white sapphire a cubic zirconia
No it is not a CZ. It is less resistant to scratches than CZ
is white sapphire more expensive than diamonds?
A white sapphire is not usually more expensive than diamonds. It is considered a precious gem though, where a diamond is semi-precious
what are lab created sapphires?
It is a sapphire that is created in a lab but have the exact same characteristics, and appearances as those mined underground, but typically have fewer flaws and imperfections than mined sapphires. They are also created in labs because they are harder to find naturally