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.
Design a custom piece built around this gemstone.
Explore our Gem First Design process.
A black diamond of 4.21 carats in a round cut — HPHT-treated, with some inclusions you can see. Diamond is the hardest natural material, prized for its brightness and fire.
Details
- Species: Natural Diamond
- Weight: 4.21 ct
- Shape and cut: Round
- Colour: Black
- Clarity: Included
- Treatment: HPHT-treated
- Documentation: Skyjems Identification Report
HPHT-treated, documented with our in-house Skyjems Identification Report. Backed by our 30-day money-back guarantee, lifetime warranty, and free sizing and cleaning for life. Come and see it in person, or call David at 416-366-3335 — and if you've got a jeweller you love, we're glad to just sell you the stone.
Design a Custom Piece
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 examined by David Saad — our third-generation coloured-gemstone specialist and honorary GIA Alumnus — 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.