3.60CT Sapphire: Sage Teal Blue Green Antique Style Precision Custom Octagon Rose Cut

Specifications:

• Gemstone: Sapphire
• Color: Sage Teal Blue Green 
• Weight: 3.60 carats
• Shape & Cut: Antique Style Precision Custom Octagon Rose Cut
• Dimensions (mm): 9.67 x 9.61 x 4.3
• Origin: Montana, USA
• Treatment: Heated

In Natural Light

This substantial 3.60 carat Montana sapphire carries a beautifully restrained blend of sage green, teal, and blue-green tones. Rather than reading as one uniform color, the stone has a layered palette that can shift between cooler teal-blue and softer botanical green depending on the lighting and viewing angle.

At 9.67 × 9.61 mm, the sapphire has an almost perfectly balanced octagonal footprint and exceptional visual presence. Its broad face allows the nuanced Montana color to become the focal point, while the antique-inspired rose-cut architecture creates larger, slower flashes of light rather than the rapid scintillation associated with a conventional brilliant cut.

The result feels simultaneously historic and contemporary: an old-world cutting concept interpreted through precise modern faceting and an unmistakably Montana color palette.

The Lapidary's Eye

This is where the stone becomes especially distinctive. At 3.60 carats with a nearly 9.7 mm square-octagonal spread, it has the scale necessary for a rose cut to make a strong visual statement.

The custom octagonal outline is remarkably balanced at 9.67 × 9.61 mm. Clipped corners soften the geometry without diminishing its architectural character, creating a silhouette that sits somewhere between a square, an Asscher-like octagon, and an antique portrait-style jewel.

Instead of relying on a conventional pavilion and tightly organized brilliant facets, the antique-style rose-cut concept emphasizes broad facet planes. These larger facets can produce deliberate flashes and reflections that change substantially as the stone moves. In a multicolored sapphire, that architecture can be particularly compelling because individual facets may emphasize different components of the sage, teal, blue, and green palette.