I was thinking about using the ShaneCo, as they have lifetime service on their rings for free. However their diamond prices seem to be inflated, which negates the free service. Has anybody bought a diamond online to save in Sales Tax? I would only buy from a reputable place (BlueNile, etc..) with a 30-day return policy, then take the stone to a place like ShaneCo to add it to a band. The engagement is still 6-8 months off, so I have plenty of time, but I am just now beginning the search. I always see people on here getting engaged, so I was wondering if people had any tips or advice about ring buying. Anything helpful is much appreciated! Thanks!