1.80 ct Natural Heated Teal Sapphire – Round Cut | GIA Certified | USA (Montana)

A natural 1.80 ct Round Teal Sapphire from Montana, USA, heat treated, GIA Report #5241017781. Teal sapphire — a bluish-green hue prized in the trade and closely associated with Montana's signature sapphire deposits — is unusual in round cut, since most material this color is cut oval or cushion to maximize weight retention. At 1.80 carats, this is larger than the typical calibrated round, making it a viable single center stone rather than a side-stone or accent piece.

Rarity Analysis

A few factors combine to make this specific stone harder to replace than a typical teal sapphire:

• Color: Teal (bluish-green) at Medium Intense saturation is Montana's signature hue, a color closely tied to that single locality rather than widely produced elsewhere.
• Size: At 1.80 ct, this stone is larger than the typical calibrated round teal sapphire, which is usually cut smaller to conserve rough.
• Treatment: Heat treated, a standard and disclosed treatment for sapphire — confirmed on the GIA report rather than left to guesswork.
• Clarity: Graded Loupe Clean, meaning no visible inclusions even under magnification — a clean grade that is not a given in this color.
• Documentation: GIA Report #5241017781 verifies weight, shape, dimensions, color, treatment, and USA (Montana) origin.
• Combined effect: A GIA-documented, above-average-size round teal sapphire from a single recognized locality is a narrower category than "teal sapphire" alone, and stones matching all of these points at once are not common in the round shape.

Buying Guidance

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

• View it in mixed lighting. Teal sapphire's blue-green color can shift subtly between daylight and indoor lighting, so viewing under more than one light source will give the truest sense of the hue.
• Check the fit for your setting. At 6.32–6.42 x 5.49 mm, this round stone will sit within standard round solitaire and halo prong dimensions, so confirm your setting's mounting size against these measurements before ordering.
• Confirm the GIA report matches the stone. When comparison-shopping Montana teal sapphires, verify that the seller's GIA report number, weight, and origin conclusion actually match the physical stone being offered.
• Weigh the size against availability. As noted in the Rarity Analysis, round teal sapphires at 1.80 ct with Montana origin documentation are not routinely available, so sourcing a close match later isn't guaranteed.
• 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

• Teal Sapphire Buyer's Guide
• Unheated Sapphire Guide
• GIA Guide
• Custom Ring Guide
• Sapphire Buying Guide
• How Cut Affects a Sapphire
• Montana Sapphire vs. Ceylon Sapphire

Why Choose this 1.80 ct Round Teal Sapphire?

Teal sapphire offers the durability of corundum (Mohs 9) in a color that reads as a distinctive blend of blue and green — without emerald's fragility, heavy oiling, and clarity compromises. Montana is one of the most recognized sources for this specific bluish-green color signature, and GIA Report #5241017781 confirms both the USA (Montana) origin and heat treatment. A round cut at this size is genuinely uncommon: the shape sacrifices weight but produces maximum brilliance, and designers working with round settings who want a teal stone will find this format directly usable without recutting.

Key Benefits of this Natural Teal Sapphire

• Round Cut in a Rare Color
  Round teal sapphire at this size is uncommon — most teal/green material is cut oval or cushion for weight efficiency.
• Maximum Brilliance
  Round brilliant cuts return more light than any other shape, making the teal color vivid and lively.
• Durable Emerald Alternative
  Mohs 9 — significantly more robust than emerald for ring use, no oil treatment required.
• Designer-Ready Format
  Round cut is the most common engagement ring setting format, usable without custom fabrication.
• Montana Provenance
  GIA Report #5241017781 confirms USA (Montana) origin, one of the most sought-after sources for teal sapphire.

Features

• Carat Weight: 1.80 Carats
• Gem Type: Natural Teal Sapphire
• Shape: Round
• Cut Style: Modified Round Brilliant
• Origin: USA (Montana)
• Treatment: Heat Treated
• Color: Teal (Bluish Green)
• Transparency: Transparent
• Clarity: Loupe Clean — no visible inclusions even under magnification
• Certification: GIA Report #5241017781
• Hardness: 9 on the Mohs scale

This 1.80 ct Round Teal Sapphire has been hand-selected for the vividness of its bluish-green color and the quality of its round cut — the combination that makes this format directly usable in standard solitaire and halo settings.

Why Customers Love This Gemstone

• Unusual Round Format: Round teal sapphire at this size is genuinely uncommon.
• Brilliant Cut Performance: Maximum light return — vivid and lively teal color face-up.
• Practical Durability: Sapphire's Mohs 9 hardness without emerald's fragility concerns.
• Montana Origin: GIA Report #5241017781 confirms USA (Montana) provenance and heat treatment.

Owning this 1.80 ct round teal sapphire means choosing a stone that combines an unusual format with practical utility and documented Montana provenance — a teal center stone that fits any round-setting design, backed by GIA Report #5241017781.

Perfect Uses for this 1.80 ct Round Teal Sapphire

• Solitaire engagement ring — teal alternative to diamond
• Halo ring center stone
• Custom pendant in round bezel setting
• Collectors of round-cut Montana corundum
• Three-stone ring center stone