Brooke Warne has got engaged to her boyfriend Alex Heath, and the proposal came with a gorgeous ring! The daughter of Shane Warne, 29, is set to tie the knot with her partner of six years after he popped the question during a holiday in the United States. Now, New Idea has learnt the eye-watering value of her glitzy pear-shaped engagement ring, which has caught the attention of her followers. Our expert, Melbourne-based jeweller Kosta Theochari,…