The Olive rigid is the best viola G string that there is. It's quite pricey with its gold content, but the sound and response is SO worth it! I have made occasional short-lived forays over the years to try other brands of strings and ALWAYS come back to the Olive G. My viola needs a Eudoxa-Olive C string to sound blended, as the Olive C has sounded false and unfocused from the start each of the three times that I have tried it. I had used the rigid Olive D with Eudoxa-Olive C and Olive rigid G strings for years, but always with very slight speaking problems on the D string in fast strokes. The Olive silver D was not an option for me, as it sounded too bright. But a few months ago, after a detailed analysis of potential candidates for a synthetic D string that might blend, I discovered the Larsen Virtuoso D (non-Soloist), which blends with the two above and a Larsen A as though they were all made for each other. No more speaking problems, my viola sounds rich, brilliant and resonant with an enormous color palate and dynamic range, and the ease of playing is tremendous as never before with the ability to hear myself clearly when the orchestra is very loud and I have in earplugs! I think part of the D string issue may be that the Olive rigid D medium gauge (17) is an unusually high tension string, whereas the Larsen Virtuoso D is a somewhat lower tension string than usual. My viola loves it!
