Buy Kolstein Cello Rosin $15.25 2. Jade L’Opera JADE Rosin for Violin, Viola, and Cello This Jade rosin is recommended by some musicians especially for warm weather and higher humidity.

The concept of rosin thumbprints and geodes are still new — and geared toward connoisseurs — so this is more of a movement than a marketing scheme right now, but never be afraid to ask ...