Silver White Topaz April Birthstone Necklace, Rose Slider Here's a rose that will stay fresh forever. Two delicate petals clasp a center gemstone, a scintillating White Topaz measuring 4.5mm. Four more petals curl up and away from the central design. The chain passes through the design virtually unseen, giving the pendant a floating appearance. Fashioned with care in our Northern Michigan foundry, this piece comes with a sparkling 18" chain. Sterling silver.