I was able to do this with the following code snippit . . .
// ********************* Convert from IGeometry to runtime geometry *********************
// Create a new instance of one Graphic.
ESRI.ArcGIS.Client.Graphic aGraphic = new ESRI.ArcGIS.Client.Graphic();
// Create a SpatialReference for the Graphic. Point Graphics are known as MapPoint objects
ESRI.ArcGIS.Client.Geometry.SpatialReference aSpatialReference = new ESRI.ArcGIS.Client.Geometry.SpatialReference(4326);
// Create a MapPoint object and set its SpatialReference and coordinate (X,Y,Z) information.
ESRI.ArcGIS.Client.Geometry.MapPoint aMapPoint = new ESRI.ArcGIS.Client.Geometry.MapPoint();
aMapPoint.SpatialReference = aSpatialReference;
aMapPoint.X = Point.X;// Point is an IPoint object
aMapPoint.Y = Point.Y;
aMapPoint.Z = Point.Z;
// Create a new instance of a SimpleMarkerSymbol and set its Style, and Size Properties.
ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol aSimpleMarkerSymbol = new ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol();
aSimpleMarkerSymbol.Style = ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol.SimpleMarkerStyle.Circle;
aSimpleMarkerSymbol.Size = 10;
// Apply the Graphic's Geometry and Symbol Properties.
aGraphic.Geometry = (ESRI.ArcGIS.Client.Geometry.Geometry)aMapPoint;
aGraphic.Symbol = (ESRI.ArcGIS.Client.Symbols.Symbol)aSimpleMarkerSymbol;
_graphicsLayer.Graphics.Add(aGraphic);