Ursula's site has a photograph (presumably from a contemporary newspaper) and states that Alice de Rothchild gave QM a diamond brooch depicting a scent bottle and true lover's knot. http://www.royal-magazin.de/england/queen-mary-marriage-presents.htm My reading of Field suggests that is what Queen Mary gave to QEQM in addition to a "small diamond horseshoe brooch which she herself had worn as a young woman..." No provenance was given for the horseshoe brooch.
--Previous Message-- : I have posted below in the appropriate place : but thought I would post here also as : further down posts are not always read. : Fields page 32 say Queen Mary gave her only : daughter in law at the time namely QEQM a : small diamond horseshoe brooch which was her : wedding gift from Miss Alice de Rothchild. : : The new paragraph also has info Q Mary : offering QEQM jewels left to the Crown. : It mentions QEQM chose snake bracelet from Q : Alexandra plus other jewels . I only mention : snake bracelet as a poster brought it up : recently. :