The affix yap comes in the sense of matup after the word rūpa when 'stamping (coining)' or 'praise' is denoted.,
Thus आहतं रूपमस्य = रूप्यो दीनारः 'a Dinara having stamped on it the form of some king &c'. रूप्यः केदारः, रूप्यं कार्षापणम्. Similarly प्रशस्तं रूपमस्यास्ति = रूप्यः पुरुषः 'a lovely person'. The form impressed on a dinar &c by hammering &c, is called आहत or stamping.
Why do we say 'when stamping or praise is denoted ?' Observe रूपवान् 'having form'.
Vart:- The affix यप् is seen after other words also, as हिम्याः पर्वताः, गुण्या ब्राह्मणाः ॥,