4.21ct Round Brilliant Cut Black Diamond
30-Day Private Inspection
Acquiring fine gemstones requires absolute confidence. We invite you to view your piece in your own home for 30 days. If it does not perfectly align with your vision, we will arrange a seamless, full-value return.
A Legacy of Trust
Our reputation is our most valuable asset. We invite you to read our independent Google Reviews to hear directly from the collectors, couples, and families who have commissioned their heirloom pieces from our bench.
Commission a bespoke heirloom built around this gemstone.
Explore our Gem First Design process.
Diamond is pure carbon under pressure so extreme that the numbers become almost philosophical — formed at depths of 150 kilometres over billions of years, then violently expelled to the surface by volcanic kimberlite pipes.
This 4.21 cts Diamond of Black hue was selected for the Skyjems Archive not as an afterthought, but as a deliberate acquisition. Natural, unenhanced diamonds with fine color grades and high clarity remain the benchmark by which all gemstone rarity is commercially measured. Acquire it with the understanding that stones of this caliber rarely circulate outside private collections.
- Species: Natural Diamond
- Weight: 4.21 cts
- Dimensions: 9.78 x 9.78 x 6.68 mm
- Shape & Cut: Round, Brilliant Cut
- Color & Saturation: Black / Black
- Clarity & Transparency: N/A / Opaque
- Treatment: HPHT
- Origin: Undetermined
- Archive Reference: FD0008
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"A record of discernment, carried in metal and light."
Commission a Bespoke Heirloom
Built around this gemstone. Explore our Gem First Design process.
Our Commitment
30-Day Private Inspection
Your piece arrives insured and fully authenticated. Live with it for 30 days. If it does not meet your exact expectations, we arrange a seamless full-value return — no questions, no restocking fees.
Fully Insured Worldwide Delivery
Every shipment is fully insured at declared value, packed in tamper-evident security packaging, and tracked door-to-door. US clients receive duty-free delivery with all customs documentation handled by our team.
GIA-Verified Authentication
Every piece is personally authenticated by David Saad, our third-generation GIA-alumni gemologist, before it leaves our care. Certified stones ship with their original laboratory documentation — GIA, AGL, Gübelin, or SSEF.
Lifetime Relationship
Our relationship extends well beyond the transaction. We offer complimentary cleaning and inspection appointments, trade-up considerations on future acquisitions, and direct access to David for gemological questions — for the life of your piece.
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30-Day Private Inspection
Acquiring fine gemstones requires absolute confidence. We invite you to view your piece in your own home for 30 days. If it does not perfectly align with your vision, we will arrange a seamless, full-value return.
A Legacy of Trust
Our reputation is our most valuable asset. We invite you to read our independent Google Reviews to hear directly from the collectors, couples, and families who have commissioned their heirloom pieces from our bench.