1.20ct Natural White H/SI1 Old Mine Cut Diamond

Overview: A stunning natural 1.20ct white diamond (H color, SI1 clarity) featuring the chunky, romantic facets and timeless appeal of a classic Modern Antique Old Mine Cut.

Vault Availability: Held in our supplier's U.S. vault. Daily changes in live wholesale availability mean direct online checkout is disabled. If this exact gem sells before your in-person order is locked in, our jeweler will immediately source similar options in cut, color, and budget for your review.

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Gemstone Specifications

• Carat Weight: 1.20ct (5.87 x 5.76 x 4.36 mm)
• Color & Clarity: White (H Color) / SI1 Clarity
• Cut / Shape: Modern Antique Old Mine Cut (Cushion)
• Origin: Earth-Mined / KPC-Compliant

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Want to see this stone in person?
We invite you to visit our Brookline shop to sit down with our bench jeweler and begin your project. To view this stone in person, we require a $500 Vault Sourcing & Design Deposit to order it in for you. Because this stone is held in a domestic U.S. vault, fully insured transit typically takes just 2 to 3 business days to reach our Brookline bench for your 7-day private viewing window. This deposit covers transit, custom 3D CAD design renderings for your mounting (with up to 2 revisions), and a physical 3D resin model to try on, with 100% applied toward your finished ring total.

What if the stone isn't the right fit?
If you view the stone in person and prefer a different color, shape, or size, your $500 deposit transfers completely toward sourcing an alternate vault gem or crafting your custom setting.

Note: The $500 deposit applies specifically to imported Vault natural gemstones, where completed custom ring builds typically average $5,000+ depending on gem selection and custom mounting details. Looking for lab-grown diamonds or working within a different budget? Custom engagement rings using our in-house lab-grown diamonds or standard gems start at $2,000 with a free initial consultation. Start a standard custom ring inquiry here.