Indeed, for some gems, such as diamonds, the price per carat can increase exponentially as the gem size increases. Therefore, a 1 carat stone may cost $1,000 while a 2 carat stone may cost $4,000. This means that good quality sapphires and rubies in larger sizes tend to have a much higher price per carat.
Re: Convert positive # to negative. Hi, if you positive number is in A1, use the following formula to convert it to a negative number =A1*-1 Time values can not be negative. Microsoft MVP http://www.teylyn.com Twitter: http://twitter.com/IngeborgNZ. Microsoft MVP.
If the lead bit is 1, the number is negative, but not just reading the bits is misleading. To convert a binary number from positive to negative, we Complement (change all the 0's to 1's) and Increment (add 1). We can go from negative to positive the same way. Here's an example (using 4 bits again).