5.39 ct Natural Unheated Blue Sapphire – Round Cut | GIA Certified | Ceylon (Sri Lanka)

A natural 5.39 carat blue sapphire in a round shape with Mixed Cut faceting (Modified Brilliant crown, Step Cut pavilion), from Sri Lanka (Ceylon), completely unheated and certified by GIA, Report #5231646038. At 5.39 carats, this is an exceptional size for any sapphire; combined with unheated status and GIA documentation, it represents a genuinely rare specification — unheated Ceylon sapphires above 5 carats rarely appear at market.

Rarity Analysis

Blue is sapphire's benchmark color — it is the most recognized and widely available hue in the species, so the case for this stone's rarity rests on treatment status, size, and documented origin rather than color scarcity.

• Color: Blue is the most common and commercially available sapphire color; rarity here is not a color story, it's what accompanies the color.
• Treatment: The majority of blue sapphire sold globally is heat-treated to improve color and clarity — a stone independently confirmed unheated by GIA is a genuine minority within the blue sapphire market.
• Size: Most commercial blue sapphire at retail is well under 2–3 carats; a clean, unheated stone at 5.39 carats sits well outside the typical size range, and availability narrows sharply as carat weight climbs.
• Origin: Ceylon (Sri Lanka) is the historic reference origin for blue sapphire, and GIA's origin determination on this report adds a layer of confirmation many stones on the market never receive.
• Documentation: GIA Report #5231646038 independently verifies weight, dimensions, origin, and unheated treatment status — a level of confirmation absent from the large share of sapphires sold without lab paperwork.
• Combined effect: No single factor above is unique in isolation, but the combination of unheated status, GIA-confirmed Ceylon origin, and a 5+ carat weight in one eye-clean stone is what actually narrows the available pool — and why a comparable stone rarely repeats at market.

Buying Guidance

A few practical points to weigh before purchasing this specific stone:

• Confirm the unheated claim independently. Don't take "unheated" on a seller's word alone — GIA Report #5231646038 is the independent verification here; ask any comparable stone's seller for the same lab-level confirmation, not just a verbal disclosure.
• Evaluate the cut for light performance. This stone's Mixed Cut (Modified Brilliant crown, Step Cut pavilion) is faceted to maximize brightness in a round shape; when comparing round sapphires, check whether the pavilion is cut for brilliance or left shallow simply to preserve carat weight.
• Plan the mounting around the stone's actual dimensions. At 10.19 x 10.43 mm, this will read as a substantial center stone; round cuts are among the more forgiving shapes for prong protection, but confirm the setting is designed around this exact girdle outline before committing to a design.
• Compare honestly against heated alternatives. Heated blue sapphire in similar size and face-up color is available at a fraction of the price; if unheated status and documentation matter to you, make sure any comparison stone carries the same GIA-level confirmation, not just a similar appearance.
• Use the Try Before You Buy option if you would like to see the stone in hand before finalizing the purchase.

Learn More About This Gemstone

• Blue Sapphire Buyer's Guide
• Unheated Sapphire Guide
• GIA Guide
• Custom Ring Guide
• Ceylon Sapphire Origin Guide
• Is a Round Sapphire Good for an Engagement Ring?
• Sapphire Buying Guide

Why Choose this 5.39 ct Unheated Ceylon Blue Sapphire?

The rarity of this stone comes from three combined factors: 5+ carats (size), unheated status (natural color), and GIA documentation (confirmed quality). At the 5+ carat level in unheated blue sapphire from Ceylon, each of these factors individually already narrows the available pool; together they represent a stone that will rarely appear at market again.

Key Benefits of this Natural Blue Sapphire

• Unheated Ceylon Origin, GIA Documented
  No thermal treatment. GIA confirms weight, dimensions, origin, and treatment status (Report #5231646038).
• Exceptional 5+ Carat Size
  Unheated sapphires above 5 carats are genuinely rare.
• Mixed Cut Faceting
  Modified Brilliant crown with Step Cut pavilion maximizes brightness and fire.
• Investment-Grade Specification
  All three premium criteria — size, unheated, certified — present in a single stone.
• Durable for Daily Wear
  Corundum at Mohs 9, second only to diamond.

Features

• Carat Weight: 5.39 Carats
• Gem Type: Natural Blue Sapphire
• Variety: Sapphire
• Shape: Round
• Cut Style: Mixed Cut (Modified Brilliant crown, Step Cut pavilion)
• Dimensions: 10.19 x 10.43 x 6.68 mm
• Origin: Ceylon (Sri Lanka) — GIA confirmed
• Treatment: Unheated — GIA confirmed
• Color: Blue
• Clarity: Eye-clean — no visible inclusions under normal viewing
• Hardness: 9 on the Mohs scale
• Certification: GIA Report #5231646038

This 5.39 ct unheated Ceylon blue sapphire has been hand-selected as an exceptional specimen — the intersection of large size, natural treatment status, and independent documentation is the combination that defines the finest collector-grade sapphires.

One of a Kind

This is a single natural gemstone, not a manufactured or lab-created replica — no two sapphires form with identical color, clarity, and internal character. Once this stone sells, it's gone; there is no duplicate. What you see documented on the GIA report is the exact, individual stone you receive.

Care

Sapphire is exceptionally durable (Mohs 9), but a few habits keep it looking its best. Clean with warm water, mild soap, and a soft brush; avoid ultrasonic or steam cleaners if the stone is set alongside softer or treatment-sensitive materials. Store separately from other jewelry to prevent surface scratches to softer pieces, and remove the stone before swimming, exercising, or household chemical exposure. As an unheated stone, no thermal treatment stabilizes the color — normal wear is fine, but avoid sudden extreme temperature changes.

Why Customers Love This Gemstone

• GIA-Confirmed Everything: Size, origin, and treatment — all independently documented (Report #5231646038).
• Exceptional Size for This Variety: 5+ carat unheated Ceylon sapphire is a rare offering.
• Vivid Blue: Intense, even saturation across the full face of the stone.
• Trusted Source: Direct from Ceylon, GIA-confirmed, treatment disclosed honestly.

Owning this 5.39 ct unheated GIA Ceylon blue sapphire means acquiring a stone that is exceptional across every criterion that defines sapphire rarity.

Perfect Uses for this 5.39 ct Blue Sapphire

• Investment-grade gemstone collection
• Statement pendant center stone
• Collectors of unheated Ceylon sapphires with GIA documentation
• Heirloom-quality custom commission
• Museum-quality private collection piece