The yantra as well as mantra are the two instruments for guiding the feelings and emotions in healthy patterns, although the viewer’s intention is paramount. When colored, the Surya Yantra is decorated with flaming purple, orange, silver and gold. I procured quite a few merchandise from rudraksha ratna. For eg. https://socialfactories.com/story118875/the-fact-about-yantra-that-no-one-is-suggesting