Kimmy|1307392953|2939194 said:http://cgi.ebay.com/0-70-CTW-DIAMON...ltDomain_0&hash=item3a62c1f4c9#ht_2259wt_1018
I don't know the seller, but here is an 18k double halo with a squared shape like the one you posted.
nfowife|1307395291|2939220 said:You can get a nice single halo at eternity diamonds:
http://www.eternitydiamonds.com/engagement-rings/