Custom Cast Platinum Halo Engagement Ring — 5.09ct IGI Round

Auri Petra Fine Jewelry

Crafted Once. Worn for a Lifetime.

Some rings are assembled. This one was engineered.

This custom cast engagement ring is crafted in solid platinum and weighs a substantial 9.42 grams, giving it the density, balance, and presence expected of a true heirloom. Designed from the ground up—not assembled from stock components—this ring was created to be worn daily and treasured for generations.

At its center is a breathtaking 5.09-carat IGI-certified laboratory-grown round brilliant diamond, graded F color and VS2 clarity, with Excellent cut, polish, and symmetry. Measuring approximately 10.89–10.95 x 6.89 mm, the diamond faces up at nearly 10.9 mm across, delivering the dramatic visual presence buyers expect from a true 5 carat round.

The stone is documented by IGI Report LG706562159 (dated May 10, 2025) and features a 58% table, 63% depth, Medium to Slightly Thick faceted girdle, pointed culet, and no fluorescence. It was created using the CVD growth process and classified as Type IIa—a high-purity diamond category prized for exceptional optical transparency. The report number is laser-inscribed on the diamond, and the IGI certificate image is included in the product gallery.

Surrounding the center stone is a finely proportioned diamond halo, designed to enhance visual size without overpowering the centerpiece. The band is richly detailed with larger accent diamonds along the shoulders and micro-set pavé throughout, creating continuous sparkle from every angle—including the side profile. All accent diamonds are graded D–F color and SI1 clarity.

In total, the ring features approximately 2.42 carats of accent diamonds, bringing the overall diamond presence to more than 7.5 total carats. Every detail—from the sculpted prongs to the finished gallery beneath the center stone—reflects intentional design and high-level craftsmanship rarely seen in mass-produced settings.

Why You’ll Love It

• Custom cast solid platinum — dense, durable, and heirloom-grade
• 5.09ct IGI-certified center diamond — F/VS2 with Excellent cut, polish, and symmetry
• Approx. 10.9 mm face-up size — commanding visual presence with crisp brilliance
• No fluorescence — bright, clean appearance in varied lighting
• CVD-grown Type IIa diamond — high-purity laboratory-grown center stone
• 2.42ct accent diamonds — D–F color, SI1 clarity, matched for brilliance and balance
• Over 7.5 carats total diamond presence
• Crafted in US ring size 7 — resizing available

A Modern Heirloom

This ring represents a modern definition of luxury—where craftsmanship matters more than markup, and documented quality matters as much as beauty.

Bold without being loud. Timeless without being traditional. Modern without sacrificing permanence.

This is not just a ring. It is a commitment cast in platinum.