2 to 5 Carat Blue Lab Grown Diamond Engagement Ring – Marquise Cut Solitaire | Celestina

For couples who want a real, certified diamond crafted to their exact specifications — without the retail markup of a national chain.

• Made to order, not pulled from inventory — every ring is handcrafted to your stone, finger size, and metal choice over 1–2 weeks. Your ring has never been worn or sat in a display case.
• Direct-from-workshop pricing — you pay for the diamond, the metal, and the craftsmanship. No retail floor, no franchise markup, no middleman.
• Every center stone IGI® or GIA® certified — independent grading report ships with the ring. Verify the specifications directly on the IGI or GIA portal.
• Custom variations welcome — different carat, shape, metal, or setting? Our craft team can quote any reasonable modification before production begins.
• Real human concierge — contact us directly for diamond questions, sizing help, or custom requests. We respond personally — not via bot.

Fancy blue diamonds are among the rarest colored diamonds on earth — the Hope Diamond, the Cullinan Blue, and the Oppenheimer Blue have all set auction records at $30M–$50M+ apiece. Natural blue diamonds owe their color to trace boron in the crystal lattice, and only a tiny fraction of mined diamonds show true blue saturation. Lab grown technology makes the romance of a true blue diamond accessible without the financial or ethical burden.

Mohana's blue lab grown diamonds are chemically, optically, and physically identical to mined blue diamonds — graded by the same IGI and GIA laboratories using the same scales. The boron-tinted color is part of the diamond's atomic structure, not a surface treatment, and will not fade.

Blue diamonds pair most beautifully with white gold or platinum settings, which amplify the cool blue tone. For warm contrast, choose yellow gold. Explore the full blue diamond collection.

Are blue lab grown diamonds real diamonds?

Yes. Lab grown blue diamonds are 100% real diamonds — same crystal structure, same hardness (10 on the Mohs scale), same optical brilliance as mined blue diamonds. Every Mohana blue diamond is certified by IGI or GIA.

What is the shank width of this ring?

The shank (the band around your finger) measures 2.8mm wide. At 2.8mm the band is well-proportioned across all 2–5 ct center stone options — slim enough to wear daily while still supporting the solitaire design at the largest size. The shank width is consistent across all metal options.

How much does this fancy blue lab grown diamond engagement ring cost?

Pricing varies by carat size and metal: 2 ct from $2,350 · 3 ct from $3,300 · 4 ct from $3,750 · 5 ct from $4,570 (10K solid gold; 14K, 18K, and platinum cost more). A natural mined fancy vivid blue diamond of comparable size would cost $30,000 to $200,000+.

Will the blue color fade over time?

No. The boron-tinted color in a lab grown blue diamond is part of the diamond's atomic structure, not a treatment. It will not fade over a lifetime of wear.

Can this ring be resized?

Yes — complimentary resizing within the first year. Full eternity bands are the exception due to their continuous diamond setting.

What is a solitaire setting?

A classic solitaire features a single center diamond on a plain band — timeless, and it lets the diamond speak entirely for itself.

What's included with my ring?

The IGI® or GIA® grading report, a signed Mohana certificate of authenticity, free worldwide insured shipping, a lifetime craftsmanship warranty, a 30-day return window, and complimentary resizing within the first year.

How long does it take to make and ship?

Each ring is handcrafted to order in 1–2 weeks, then ships free worldwide with full insurance.

Can I customize this ring?

Yes — contact our team through customer support to request a custom variation in a different carat, shape, or metal combination.