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A Sanskrit term. Usually as prefix ([[rat na]]...) ...indicates a gem or gems, jewel(s), precious or jewel-like quality.  Also see [[dkon mchog]], [[Ratnasambhava]], the [[Ratna-family]], and the ratna-heruka/[[sadhana]], [[Nectar Quality]] ([[bdud rtsi yon tan]]) in association through [[che mchog]]. ([[RWB]])

According to Sanskrit source [http://webapps.uni-koeln.de/tamil] - a gift , present , goods , wealth , riches; a jewel , gem , treasure , precious stone (the nine jewels are pearl , ruby , topaz , diamond , emerald , lapis lazuli , coral , sapphire , Gomeda ; hence {ratna} is a name for the number 9 ; anything valuable or best of its kind, ie. an excellent son) ; a magnet , loadstone.