On first glance as I pulled up and started cruising through the Color Craft web site and saw things rings, I thought - oh, opals. Then I thought - oh not opals. Hmmm? The description below them revealed what the heck these gemstones really are - topaz:

Colored Topaz is a new high-tech gem available in an amazing array of colors, including gems that show many colors at once. This beautiful natural topaz is enhanced by the gem cutter's art and a touch of rocket science: high-tech physical vapor deposition of a metallic layer which creates amazingly vivid tones. The coloring is durable and will last for years with proper care. Colored Topaz is available in an amazing palette of fashionable colors. Blues that echo the ocean and sky. Greens that are as lush as the fields and forest. Yellows of the sun and sunset skies. Pinks of tropical blooms and delicate blossoms. Purples of the twilight skies. Add more color to your life with this gem that matches your every mood.