10K Gold Blue Topaz Birthstone Cushion Cut Diamond Rings  Blue topaz takes center stage in this brilliant, eye-catching ring. Topaz represents friendship, love and wealth, and is the birthstone for December. This ring presents a natural 6 X 6mm square (princess) cushion cut blue topaz birthstone, accented wonderfully by four white round diamonds. The blue topaz totals approximately 1.1 carats. The ring is crafted of 10K solid yellow gold. This cushion cut birthstone & diamond ring qualifies for free custom ring sizing. Size 6 1/2 is standard. When you order a custom size, please allow an additional 7-10 business days processing time.