Interesting combination ring- Gold nugget from Tennant Creek (.72 grams) and a Coober Pedy 'crystal' opal.Oval shape(4 x 6.5 mm, 0.35 cts) bright orange, red and green. The 18 karat yellow gold ring is 8mm wide in the front and 4 mm in the back. 
Weight of ring is 6.7 grams and its size is N1/2.