5.078 Carat Unheated Cushion Cut Sapphire – The "Alpha" of the Vault

Natural, Unheated Deep Blue Sapphire — 5.078 ct

Crossing the 5-carat threshold places this 5.078 carat natural sapphire into a markedly rarer category of fine material. At this size, the vast majority of sapphires are routinely heat-treated to improve color or clarity. This example remains completely unheated, preserved in its natural state exactly as it formed within the earth.

Its combination of significant carat weight, untreated provenance, and balanced deep blue color positions it well above standard commercial sapphires and into a category sought by collectors and high-end custom jewelry designers.

Color Profile — Deep Blue

This sapphire displays a deep blue color profile characterized by strong saturation and a medium-to-deep tone. Rather than a bright commercial blue engineered through treatment, the color reflects natural depth and density, offering a more refined, understated presence.

Under direct lighting, the stone reveals rich blue body color across the crown facets. In lower or ambient light, the tone deepens, presenting a classic, elegant blue favored by collectors who value natural color integrity over artificial brightness.

This color profile is especially well suited for custom jewelry where contrast, metal choice, and setting design are used to enhance presence rather than relying on surface brightness alone.

Cut & Visual Presence

Cut in a cushion shape, this sapphire benefits from a faceting style known to retain and redistribute light more evenly than elongated shapes. Cushion cuts are traditionally favored for sapphires of deeper color, as they help maintain visual balance while preserving weight.

The stone presents a strong face-up appearance, offering substantial visual presence consistent with its 5-carat weight. Its proportions support even color distribution across the crown, making it suitable for both classic and contemporary designs.

Rarity & Collector Appeal

Unheated sapphires exceeding 5 carats are uncommon, particularly when combined with clean transparency and stable color. Many stones in this size range are either heavily treated, overly dark, or compromised in cut to preserve weight.

This sapphire appeals to buyers who prioritize:

• Natural, untreated provenance
• Meaningful 5+ carat size
• Deep, classic blue coloration
• Long-term scarcity rather than trend-driven color profiles
• Suitability for bespoke or heirloom-oriented jewelry

It is best suited for collectors and designers seeking substance, scale, and authenticity, rather than mass-market brilliance.

All specifications are independently tested and verified by a recognized gemological laboratory. The original laboratory report is provided with purchase.

Gemological Specifications

• Identity
  • Species: Natural Corundum
  • Variety: Sapphire
• Physical
  • Carat Weight: 5.078 ct
  • Dimensions: 10.15 × 8.04 × 6.28 mm
  • Shape & Cut: Cushion, Mixed Cut
• Optical
  • Color: Deep Blue
  • Hue / Tone / Saturation: Blue · Medium-Deep Tone · Strong Saturation
  • Transparency: Transparent
  • Clarity: Eye-clean to lightly included
    (No durability-impacting features observed)
  • Fluorescence: None observed
• Provenance & Documentation
  • Geological Origin: Basaltic-related deposit (lab verified)
  • Treatment: No indications of heating
  • Laboratory Report: Bellerophon Gemlab (B45894)

Estimated Market Value Range (Contextual Reference)

Market values are provided for contextual reference only and may vary based on venue, timing, and buyer preference.

Estimated Market Value Range (2026 Index)

• Commercial–Fine Market
  • (Dealer retail / online listings)
    $1,800 – $4,200 per carat
    Approx. $9.000 – $21,000 total
  • Typically reflects heated material, smaller stones, or sapphires lacking verified unheated status.

• High-End Unheated Segment
  • $7,500 – $12,000 per carat
    Approx. $38,000 – 60,000 total
  • This is the current benchmark for 5ct+ cushions with verified 'No Heat' status. The cushion cut carries a 15% shape premium due to its high demand in bespoke bridal jewelry.

• Exceptional / Specialty Markets
  • $15,000 – $25,000+ per carat
    Approx. $75,000 – $125,000+ total
  • Achieved for top-tier Royal Blue saturation and heritage-grade clarity in 5ct+ unheated specimens.