Warchal Amber Cello D String, synthetic core wound with hydronalium and pure silver
Before this string, I had Versum D installed. This string is perhaps my favorite D string I have ever tried. The sound is colorful, brilliant, with plenty of warmth and projection. It feels really comfortable under the fingers, even though it is thicker than any standard steel D string. I did have to adjust my bowing style as it is a synthetic core string — I can’t dig in nearly as much as a steel string, so I have to “carve” the sound, but it’s good for me given how I sometimes tend to play way to heavy... Breaking in and stretching did take about a week.
My current setup: Versum A, Warchal Amber D, G, and C; before I had Versum on both A and D. After the D string settled in, the entire cello became brighter, but not in a bad way since there are many more rich overtones. Props to Warchal for making synthetic core strings that project well.