Stoneline Group SL24-D-A-770-30-80 24" x 24" Travertine Tumbled Paver Silver 2" 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.