Carat weight: 0.83
Cut: Ideal
Color: J
Clarity: SI1
Certificate: GIA
Depth: 60.8%
Table: 56%
Crown: 33.8
Pavillion: 41.3
Polish: Very Good
Symmetry: Very Good
Girdle: Thin to medium
Culet: None
Fluorescence: Faint
Measurements: 6.08*6.12*3.7
Based on your numbers, the diamond scores a 3.4 on the HCA, so I would pass on this stone regardless of the price since the score is over 2.
Using the Price Comparison tool, I found three 0.83 SI1/J stones in the $1700-$1900 range, so IMO I wouldn''t say this is even a good deal.
Try using the "Search by Cut" tool under the "Price" heading at the top of the page. This will return stones with good proportions to help you in your search.