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Author Topic: Gemboree 2023 competition  (Read 167 times)

Faceting Frank

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Gemboree 2023 competition
« on: August 01, 2022, 03:38:59 PM »
Is anyone cutting Zircillion 7 section 0.10.1 in the Gemboree comp. There are four sets of facets in the preform and I don't understand what row 2 and 3 are supposed to do. I never cut them and cut the girdle facets to a stop and then went onto the pavilion facets.
« Last Edit: August 01, 2022, 04:31:31 PM by Faceting Frank »

mehoose

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Re: Gemboree 2023 competition
« Reply #1 on: August 01, 2022, 05:59:38 PM »
the booklet is taking an age to download...
I noticed this amendment on the front page.. is it what you're after?
 
"Please note this booklet is the version issued 23 June 2022. It contains a new page 58 Trilled drawing, with Crown B angle as 40 not 20 as shown in earlier versions of the booklet."
Keep em comin!!!

Faceting Frank

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Re: Gemboree 2023 competition
« Reply #2 on: August 01, 2022, 09:06:00 PM »
I check for updates that are relevant to the open section faceting. This stone is a triangle. The preform starts with the girdle facets 1, establishing the sides, then two sets of six facets 2, and 3, cut to a TCP. The angles are 32.47 and 29.62, then six girdle facets establishing the three corners. The pavilion instructions start with two rows of facets at the same indexes as 2, and 3, but at angles of 44.8 and 40.38. Your standard pavilion angles, what's the 32.47 and 29.62 angles for? If anyone on here wants to cut that stone use the 44.8 and 40.38 angles only.

 

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