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Natural Tanzanite - 4.51ct Pear Cut (IGE Certified)

A 4.51 carat pear-shaped blue tanzanite gemstone next to its official IGE gemological report D-52834. - view 1
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Estimated value

$850 - $1,400

Rarity

Scarce(6/10)

Category

Gemstones

Era

2025 (Date of certification)

Origin

🇹🇿 Tanzania

Authenticity

Very High(85%)
34

NATURAL TANZANITE - 4.51CT PEAR CUT (IGE CERTIFIED): IDENTIFICATION

A single loose pear-shaped gemstone identified as natural Tanzanite weighing 4.51 carats. The specimen displays a characteristic violetish-blue hue with moderate saturation and visible internal inclusions. It is accompanied by an Instituto Gemológico Español (IGE) report number D-52834, dated February 27, 2025. The stone measures 13.32 x 8.84 x 5.90 mm and is housed in a clear security seal pouch matching the report number.

Compare with other gemstones in the archive: Natural Diamond - 0.45ct Round Brilliant (GWLAB Certified), 0.50 Carat Round Brilliant Diamond (AIG D2410518829), Natural Amethyst Geode Cathedral - Brazilian Origin.

CROSS-CULTURAL PARALLELS

Where This Object Echoes

Modern Western Jewelry21st Century

Added to the official list of birthstones (December) in 2002, the first change to the list since 1912.

Ritual & Ceremonial Use

  • •Maasai tradition involving the color blue as a sacred hue representing fertility and new life, often associated with the discovery of the stone.

Meaning Through Time

1960s

Regarded as a scientific curiosity when first identified as zoisite.

1980s-Present

Marketed as an 'investment stone' due to the depletion of the primary deposit.

GEOLOGICAL ORIGIN

Tanzanite was first discovered in the Merelani Hills of northern Tanzania in 1967 and was named by Tiffany & Co. after its country of origin. It is a blue-violet variety of the mineral zoisite. Unlike traditional gemstones known for centuries, tanzanite's commercial history is less than 60 years ...
Tanzanite was first discovered in the Merelani Hills of northern Tanzania in 1967 and was named by Tiffany & Co. after its country of origin. It is a blue-violet variety of the mineral zoisite. Unlike traditional gemstones known for centuries, tanzanite's commercial history is less than 60 years old, with production limited to a 14-square-kilometer area near Mount Kilimanjaro.

COLLECTOR NOTES

1

Tanzanite is 1,000 times rarer than diamond specifically because it is found in only one location on Earth.

SCARCITY

Scarce80-90%
CommonLegendary

Genuinely harder to find. Perhaps only dozens come to market annually. Collectors actively watch for these pieces.

Rarity 6/10. Curiosa currently catalogues 2 gemstones items at rarity 6 or higher.

Typical Characteristics

  • Dozens per year at market
  • Documented provenance valued
  • Active collector pursuit

Confidence Factors

  • Gemstone is sealed in a matching IGE security pouch
  • Report D-52834 contains a verifiable QR code and holographic seal
  • Visual characteristics of the stone align precisely with the report's measurements and weight
How does authenticity detection work?

GEMOLOGIST'S TAKE

Gemologist & Mineral Specialist

Gemologist

Confidence is high due to the presence of a reputable lab report (IGE) and a matching security-sealed pouch, though visual clarity of the stone itself is limited by the photograph.

KEY EVIDENCE

  • 1Confirmed weight of 4.51 carats on IGE report
  • 2Specific 'F1 - oil' enhancement identification
  • 3Violetish blue hue consistent with zoisite species
  • 4Matching identification number D-52834 on both pouch and report
  • 5Dimensions of 13.32 x 8.84 x 5.90 mm

UNCERTAINTIES

  • •The F1 oiling indicates the stone has clarity-affecting fractures
  • •Saturation appears moderate rather than the 'vivid' grade seen in top-tier specimens

WHAT WOULD IMPROVE CERTAINTY

  • →Verify the QR code on the IGE website to confirm the report's digital record
  • →Examine the stone under 10x magnification to assess the extent of the oiled fissures
  • →Check for pleochroism using a dichroscope to confirm trichroic properties

CONDITION & GRADE

I1 to I2 (Included)

Grading breakdown

The 'F1 - oil' notation and visual cloudiness suggest internal characteristics that affect transparency and brilliance, placing it in the Included grade range.

Condition

The stone shows moderate crystalline inclusions visible to the naked eye. The IGE report indicates an enhancement level of F1 (Minor), which means oil or resin was used to fill surface-reaching fractures.

GEMSTONE VALUATION

$850 - $1,400

Updated: May 11, 2026

Who buys this

Private jewelry collectors looking for large carat weights for custom pendants or investment-oriented mineral buyers.

What increases value

  • •Carat weight over 4cts is a significant benchmark for tanzanite
  • •Certified origin (Tanzania) and identification

What lowers value

  • •F1 clarity enhancement significantly lowers value compared to untreated or heat-only stones
  • •Visible inclusions reduce brilliance and market demand

What makes top-tier examples

  • •Vivid 'Pigeon Blood' blue-violet saturation
  • •Eye-clean clarity with no oil or resin filling (Untreated)

Grade & condition

Color saturation, clarity (presence of fissures), and the level of artificial enhancement (oiling).

Rarity & demand

ScarceModerate demandModerate liquidity
Browse similar gemstones objects

For informational purposes only, not a formal appraisal.

FROM THE CABINET OF

The Collector

The Collector
Relic Hunter•117 items

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