Size 10 Domed Tidepools band with Fires Oxide and Single Platinum Rail/Liner with flush set Lab Alexandrite and Moissanite you would be looking at a total of $5415.

The single platinum rail band with the Tidepools pattern and the Oxide goes for $3955. I calculated about 26-28 stones for this size to get the spacing like the above ring. I was thinking about 1/4 of them moissanite and the rest lab alexandrite. The cost per stone for moissanite is $40 which includes the setting fee and the cost for alexandrite is $58/stone. So 9 moissanite would be about $360 and 19 alexandrite $1100.