@ Tomjmor, if'n the ring hasn't been handed in yet the you can forget about it, unless you want to trawl eBay and all other second hand selling sites.
If'n your Female then just tell your husband/wife that you lost it, if it is a husband then he really won't care a whole lot.
If'n your a Male then replace it with an identical ring ASAP and if she/he/it notices it looks new, assuming that it is a She then tell her you just had it in to the jewelers be cleaned and that's why it was missing fer the last few days.
NEVER EVER tell her you lost it in a Taxi, there is only One reason a man takes off his wedding ring in a Taxi.
A replacement ring whatever it costs is money well spent as opposed to years of verbal grief !