4 Carat Blue Radiant Lab Grown Diamond Engagement Ring Three Stone Trapezoid Cut

Material Selection: 10K, 14K, 18K Solid Gold, Platinum Pure

Metal Color Selection: Rose Gold, Yellow Gold, White Gold

Center Stone Type Selection: Lab Grown Diamonds

Diamond Cut: Radiant Brilliant Center + Trapezoid Brilliant Side Stones

Center Stone Size: 4 Carat Blue Radiant (10.20x8.20mm)

Side Stones: 2 Trapezoid Cut Diamonds (6x4x4mm each, 0.90ct each, 1.80ct total)

Total Carat Weight: 5.80 Carats

Setting: Three-Stone (Radiant + Trapezoid + Trapezoid)

Band Width: 3mm

Diamond Clarity: VS (Best Only)

Diamond Color: Fancy Vivid Blue

Certification: IGI® or GIA® Certified

The rarest diamond color, sculpted in architectural brilliance — a 4 carat vivid blue radiant cut lab grown diamond flanked by two trapezoid side stones totaling 5.80 carats across all three diamonds. Blue is the rarest and most valuable fancy diamond color, and the radiant cut’s 70 brilliant facets concentrate that precious blue across the entire 10.20x8.20mm surface — creating a deep, mesmerizing pool of sapphire fire that no step-cut or cushion shape can replicate. The radiant traps blue light within its brilliant facet matrix and disperses it with explosive intensity, making the blue appear deeper and more saturated than any other rectangular shape. The two 0.90 carat trapezoid diamonds taper seamlessly against each side, their bright white sparkle contrasting dramatically with the vivid blue center — like moonlight framing the midnight sea. A 4 carat natural vivid blue diamond would cost hundreds of thousands of dollars. Lab-grown technology delivers the identical chemical composition, 10 Mohs hardness, and brilliance at a fraction of the price. Set in white gold or platinum for a cool-toned masterpiece of ice and ocean that commands attention from across any room.

How This Ring Compares

Feature	This Ring	Brilliant Earth	Blue Nile	With Clarity
Center Stone	4ct Blue Radiant Lab Diamond	1–1.5ct Blue Radiant	1ct Blue Radiant	1–1.5ct Blue Radiant
Side Stones	2 Trapezoid (0.90ct each)	Pear or Round sides	Baguette or Tapered sides	Pear or Round sides
Total Carat Weight	5.80ct (4ct + 1.80ct sides)	Varies (typically 0.3–0.8ct sides)	Varies (typically 0.3–0.8ct sides)	Varies (typically 0.3–0.8ct sides)
Certification	IGI® or GIA®	IGI	IGI/GIA	IGI/GIA
Metal	10K, 14K, 18K Gold, Platinum	14K, 18K	14K, 18K	14K, 18K
Made to Order	✓ Handcrafted for you	✗ Pre-made inventory	✗ Pre-made inventory	✗ Pre-made inventory
Price Range	Fraction of competitors	$6,000–$12,000	$4,000–$8,000	$3,000–$6,000
Free Worldwide Shipping	✓	✓ US only free	✓ US only free	✓ US only free
Insurance Included	✓	✗ Separate purchase	✗ Separate purchase	✗ Separate purchase

What You Get That They Don’t Offer

• 4 carat vivid blue radiant — the rarest fancy diamond color in the most brilliant rectangular cut. No competitor offers a 4ct blue radiant center with trapezoid sides. The radiant’s 70 facets concentrate blue to its deepest saturation, creating a mesmerizing pool of sapphire fire
• 4 carat blue radiant center — competitors typically cap blue lab diamond options at 1–1.5 carats. This 4 carat center stretches vivid blue across a commanding 10.20x8.20mm surface, creating a visual impact that smaller blue stones simply cannot achieve
• 5.80 total carats — the blue radiant center plus two 0.90 carat trapezoid sides deliver a total weight that far exceeds typical competitor three-stone blue diamond offerings
• Lab-grown makes a 4ct vivid blue radiant accessible — a natural mined equivalent would cost hundreds of thousands of dollars. Same chemical composition, same 10 Mohs hardness, same brilliance at a fraction of the price
• Trapezoid sides create ice-and-ocean contrast — bright white trapezoids tapering flush against the vivid blue center produce a dramatic cool-toned statement like moonlight on water
• Blue radiant in white gold or platinum = cool-toned masterpiece — vivid blue center, bright white trapezoid sides, and sleek white metal create the most sophisticated blue diamond presentation available
• 10K gold and Platinum Pure options — from the most accessible entry to the most premium setting for a certified 5.80ct blue diamond ring. No competitor offers this range
• Handcrafted to order — your exact ring size, metal karat, and gold color
• Free worldwide shipping and insurance included — competitors charge extra for both

Production: Made to order, 1–2 weeks processing time

Includes: Free worldwide shipping, insurance, IGI® or GIA® certification

Approximately 1-2 weeks from order date

As we create each piece to order (unless specified otherwise in the item description), please allow 1-2 weeks for production time. Please see the Worldwide Shipping tab for delivery timelines and details.

Order Prioritization

If you’re looking for a shorter turnaround, please contact us prior to ordering so we can confirm if this is feasible.

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