This elegant ring features a single cushion-cut tanzanite gemstone set in 14kt yellow gold. The tanzanite measures approximately 10 x 8 mm and displays the stone's signature blue-to-violet pleochroism — shifting between rich blue and purple hues depending on the light angle. The cushion cut enhances the stone's natural color saturation and brilliance, while the yellow gold setting provides a warm, classic contrast.

The ring is size 7 and is sizeable within one size by a qualified jeweler (Costco does not provide resizing). The setting is crafted from solid 14kt yellow gold and is designed to hold the center stone securely. As with all colored gemstones sold by Costco, this tanzanite has been enhanced in the production process, which is standard practice in the industry to improve color and clarity.

Tanzanite is a December birthstone, found exclusively in the Merelani Hills of Tanzania near Mount Kilimanjaro. Its rarity and vivid trichroic color make it a prized gemstone for fine jewelry. Air shipping via UPS (insured) is included in the purchase price, with delivery in approximately 2–3 business days from the time of order.