These Yellow and Purple Titanium tumbles are a visually spectacular piece — the combination of yellow and purple titanium coating on natural Quartz creates a striking dual-tone iridescence that shifts between warm golden-yellow and cool violet depending on the angle of light. The effect is genuinely extraordinary, and these dual-tone tumbles are particularly popular for their unusual and eye-catching appearance. At $4 each these are an incredibly affordable and visually impressive piece that adds real colour and sparkle to any crystal display.