A Striking Stand Out. Iris has three defining features that make it one-of-a-kind. First are the tiny bubbles that are embraced by the glass, a trademark of mouth-blown craftsmanship. Second is the striking citrine color that is infused in the glass and will never lessen over time. Third is the unique shape of this collection, another testament to the handmade nature of Iris. This collection will bring flair and individuality to your table.