Below are examples of diamonds of similar weights & qualities but of different prices.

ONE  GIA certified diamond IS NOT THE SAME AS A
HRD, IGI or EGL certificated one.
NO CERTIFICATE WILL GIVE YOU THE GUARANTEE that
WHAT you see on PAPER is really what you are GETTING.

Weight

Quality

Price

0.30ct. to 0.45ct.

H VS1

1100/1300

0.50ct. to 0.65ct.

G VS1

1600/1900

0.70ct. to 0.85ct.

F VS1

2500/2700

0.90ct. to 0.96ct.

F SI1

2200/2500

1.01ct. to 1.35ct.

D IF

7500/8500

Prices are in  £'s per carat
to obtain a price simply multiply it with the weight.
( ie. 0.52ct. x £1000/ct = £520 total price)