Diamond Scale??

One of my crazy research's is about Diamonds....

Hope we have a jeweler or someobody that can answer this questions:

What kind of diamond scale is better a:
10 x 0.001gram

20 X 0.001g

500 X 0.1 Gram With 100 Gram Calibration Weight

100g X 0.01g

500 x 0.05-ct

???????????

HELP!!! What scale can measure the weight from a tiny chip to a 3 carat diamond???

thanks for any info.

CK sent your question to my jewerly store folks. might know something monday. i will forward you the reply