5.84ct Oregon Fire Opal flatback "lens cut"
This Oregon Fire Opal is a "flatback" or "rosette" but this cut really makes the most of the stone.
It throws amber and gold opalescence with its "lens cut" and would look great in a design where you can see the pattern of the metal behind it bending as a result of this faceting design.
The weight is 5.84ct, and the size is a huge 16.2x10.7mm. It would be perfect in a large pendant, perhaps with a halo of stones in a color that compliments the amber color, such as imperial topaz, citrine or even ametrine to shake the color up a bit.
Whatever you choose, this stone is sure to be an attention grabber.