Stoneline Group SL66-D-A-770-30 12" x 24" Travertine Tumbled Paver Silver 1.25" Thickness. The Silver Collection of travertine stones is at the apex of elegance, versatility and classical appeal. The Silver collection is a classic travertine silver with a slight contrast of silver gray and golden beige. Its metallic tones give it a high-end quality that makes the Silver Collection especially appealing for luxurious and contemporary decor.