Frome River Sapphires

I have been provided with some sapphires from the Frome/Weld River area (NE Tasmania) to cut for an avid prospector. The two I will begin with are quite different in nature. A smaller stone with good clarity and light colour, and a larger, quite dark blue stone, with distinct growth bands visible.

Gee, Tasmanian sapphires when well-coloured can match it with the very best.

Frome River (NE Tas) sapphire, 2.2ct
5.5ct sapphire: dopped and ready

This large stone, dopped above, would benefit from being cut as shallow as possible to help lighten it, whilst still considering the critical angle of 34.45°. I think the Jeff Graham Quickie 2 may be a good choice @ 91.2% light return.

Quickie 2 cut

Ok – update, having started the pavilion, some cracks that were not visible before cutting, due to the darkness of the stone, are clearly apparent now. This is a typical example of the sorts of challenges that often present themselves during the cutting process.

This has lead to a rethink as to the best cut. The roundish Quickie would now yield unacceptably low, a more rectangular stone would be better so that I can cut the defects off without losing too much stone carat weight.

Obvious cracks and defects
This angle clearly reveals the growth lines

Changing to a rectangular cushion cut, the Tsunami-311 in fact.

Rectangular cushion cut – Tsunami 311
Looking better, still some more to cut off top-left
And better..
Good!

Time for some polishing

Pavilion polished and ready for transfer
Transfer in progress – epoxy on top, wax on bottom.
Crown underway
So far, so good
Table is in
Interesting stone – this cut is much harder than I thought it would be..
look at those bands!
Shiny as.
Pre-polish was tricky, but all done now, very pleased. Final polish next.

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