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Blockchain Innovation · Diamond Gold Jewelry Grading

6C Defining Brilliance

BGI seamlessly integrates diamond, gold, jewelry, and silver grading with blockchain NFT technology. Every certificate is unique and immutable. Experience 6C standards + cryptographic trust, redefining gemstone, precious metal, and ornament authentication.

Explore 6C Standards NFT Certificates
100%

Non-replicable certificates

On-chain

Permanent verification

6C

Complete grading system

NFT Certificates · Blockchain Authentication

Every BGI diamond, gold, jewelry, and silver certificate generates a unique NFT digital credential with on-chain hash verification—immutable and unforgeable. Combined with smart contracts, supporting lifetime authentication.

Cryptographic digital signature
Decentralized verification
Permanent timestamp

About BGI BIT Gemological Institute

BGI (BIT Gemological Institute) is headquartered in Shenzhen, China, and is the world's first gemological institution to adopt blockchain NFT technology for diamond, gold, jewelry, and silver ornament grading certification. All grading results generate a unique NFT digital certificate, with hash values uploaded to the public blockchain, ensuring immutability and full traceability.

BGI's 6C standards add Clara brilliance grading and Crypto encryption on top of traditional 4Cs, bringing a higher dimension of trust to the diamond, gold, jewelry, and silver ornament industries.

BGI Exclusive 6C Diamond Standards™

Building on traditional 4C, adding Clara (Brilliance) and Crypto (Blockchain) for more comprehensive diamond, gold, jewelry, and ornament valuation.

BGI 6C Standards Official Definitions

Carat Weight
The weight of the diamond measured to 0.001ct, directly determining rarity. BGI uses high-precision equipment for authoritative measurement.
Color Grade
Colorless degree grading from D (completely colorless) to Z (faint yellow). Strict colorimeter and spectral analysis ensure professional reliability.
Clarity Grade
Purity grading from FL (flawless) to I3 (included). Identified under 10x magnification, precise to inclusion position and size.
Cut Grade
For round diamonds only. Evaluating brightness, fire, and sparkle from Excellent to Poor to maximize optical performance.
Clara Grade
BGI's innovation: Clara 1~5 levels representing Good, Very Good, Excellent, Exceptional, and Ultimate brilliance. Based on light interaction modeling.
Crypto
Each certificate generates NFT with hash on-chain, immutable. Digital signature + timestamp for global unique verification.

Carat Weight 克拉重量

Precision to 0.001ct International Standard

Carat weight directly determines rarity. BGI uses high-precision equipment for authoritative measurement data.

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Color Grade 颜色等级

D (Colorless) → Z (Faint Yellow)

Strict colorimeter and spectral analysis to determine each diamond's colorless degree.

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Clarity Grade 净度等级

FL → IF → VVS → VS → SI → I3

10x magnification identifies inclusions with precision to position and size.

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Cut Grade 切工等级

Round diamonds only · Excellent ~ Poor

Evaluating brightness, fire, and sparkle to maximize optical performance.

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Clara Grade 璀璨度

Exclusive light performance grading
Clara 5 Ultimate Clara 4 Exceptional Clara 3 Excellent Clara 2 Very Good Clara 1 Good

Defining diamond brilliance intensity through light interaction modeling.

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Crypto 加密存证

Blockchain · Immutable

Each certificate hash on-chain, NFT certificate with digital signature + timestamp for global unique verification.

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Professional Education & Training

From gemology to blockchain technology, BGI offers comprehensive industry empowerment programs

Gem & Jewelry Grading Masterclass

Diamond and gold grading, colored gemstone identification, jewelry and silver appraisal, hands-on laboratory practice. Obtain BGI certified appraiser credentials.

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Diamond, Gold & Jewelry Appreciation

High-level diamond, gold jewelry, and silver ornament appreciation, antique jewelry arts, fire grading practice to enhance aesthetic and collection knowledge.

Appreciation Salon

Blockchain & Jewelry Technology Training

NFT minting, smart contracts, digital certificate applications—cutting-edge courses bridging traditional jewelry, gold, and silver sectors with Web3.

On-chain Training

⚡ BGI NFT Digital Certificate ⚡

Every grading result for diamonds, gold, jewelry, and silver generates a unique cryptographic credential, permanently stored on the blockchain

BGI Blockchain Certificate

NFT #BGI-1024
1.52 ct
D (Colorless)
IF
Excellent
Ultimate (Clara 5)
On-chain encrypted
Smart Contract Address
0x7fE3...b9cA2D
Certificate Hash
0x71dF9c8aB3eF4d2a1b5c7e9f0...8a3b

Scan for complete on-chain record

Blockchain Verification System

Enter certificate number or NFT ID to verify authenticity and on-chain status

All BGI certificates are stored on Ethereum sidechain, immutable and globally unique. Try any BGI number to experience verification.

About BGI

BGI (BIT Gemological Institute) is a globally leading blockchain diamond, gold, jewelry, and silver grading institution, dedicated to perfectly integrating traditional gemological craftsmanship and precious metal appraisal with modern blockchain technology.

We believe every diamond, gold piece, jewelry item, and silver ornament carries unique value and story. Through NFT certificate technology, we ensure these values are authentically recorded and never lost.

GIA-standard grading process
Blockchain anti-counterfeiting traceability
NFT digital certificates globally accepted
Professional diamond, gold, jewelry & silver grading team

Grading Industry Data

50K+
Annual Grading
99.9%
Accuracy
30+
Countries
100%
On-chain Records

Contact Us

Start your blockchain diamond, gold, and jewelry grading journey

Email

[email protected]

Frequently Asked Questions

Everything you need to know about BGI 6C blockchain diamond, gold, jewelry, and silver certificates

BGI adds Clara brilliance grading and Crypto blockchain encryption on top of the traditional 4Cs. Each certificate generates a unique NFT that cannot be replicated and is permanently verified on-chain. BGI also applies this blockchain technology to gold, jewelry, silver, and ornament certification.
Enter the certificate number or NFT ID on the BGI official website. The system compares the on-chain hash and displays the verification result. All certificates are stored on Ethereum sidechain.
Yes, BGI offers gem and jewelry grading masterclasses, diamond, gold and silver ornament appreciation courses, and blockchain technology training. Visit bgigem.com for more information.
Clara is BGI's exclusive grading standard. Based on light interaction modeling and brilliance analysis, it classifies diamond brilliance intensity into 5 levels: Good, Very Good, Excellent, Exceptional, and Ultimate.
Each BGI certificate generates a unique NFT digital credential. The certificate hash is uploaded to the blockchain, combined with smart contracts and digital signatures, forming an immutable cryptographic fingerprint that is globally unique and verifiable.

Last Updated: March 2026 · Blockchain Certificate Standards Version 2.0 · BGI 6C Diamond Standards™