Silver Alexandrite June Birthstone Necklace, Rose Slider - Here's a rose that will stay fresh forever. Two delicate petals clasp a center gemstone, a colorful Lab Created Alexandrite measuring 4.5mm. This is a color changing gem, it will refract teal, blue, and purple based on what light hits it. 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.