Helzberg Diamonds has a spectacular collection of gemstones in white and colored gemstones in all colors of the rainbow including emerald green color, blue color, pink, and varying shades of red. Gemstones have been used in engagement and wedding rings for thousands of years since ancient times and make great colored diamond alternatives. Use our gemstone guide to learn how to care for and clean your gemstone jewelry. Shop alexandrite, amber, amethyst, aquamarine, blue apatite, chrome diopside, citrine, emerald, garnet, jade, marcasite, moissanite, morganite, onyx, opal, pearl, peridot, quartz, ruby, sapphire, tanzanite, topaz, tourmaline, and turquoise - or shop all gemstone jewelry - today! Gemstones physical properties vary to mimic the brilliance and strength of diamonds but some gemstones can be extremely rare making them precious stones, unmatched in both color and shine.