Calculating the Crown Angle

Written by Deia:Posted this here for you as maybe you'll get more answers there! I messed up on the e though lol, sry!

http://www.pricescope.com/forum

Written by chonc76:Hi All,

I wanted to ask a very technical question that only the most qualified can answer definitively. I deciding whether or not to buy a round brilliant stone that was GIA certified in 2000 and unfortunately they didn't measure the Pavilion Angle only the Crown Angle; nor did they assign a cut grade during that time. The specs of the stone are below:

Round Brilliant
Measurements: 6.27 - 6.32 x 3.79 mm
Carat Weight: 0.91 carat
Color Grade: F
Clarity Grade: VS2

Proportions:
Depth: 60.2%
Table: 60%
Crown Angle: 33.0
Pavilion Angle: ??
Girdle: Thin to Medium, Faceted
Culet: None

Finish:
Polish: Good
Symmetry: Good
Fluorescence: None

Can the other missing dimensions/angles be calculated based on the above information? I'm trying to determine the cut grade based on the dimensions of the stone. I saw an article here about the myth of 60/60 which this diamond falls into so I wanted it to ask some experts if this could be a very good to excellent cut stone.

Second question, given all the information what is a fair price for the stone?

I hope I didn’t overstep the boundaries of this forum and I appreciate any advice technical experts can give.

rockytalky/calculating-the-pavilion-angle-t165453.html