2.5 Carat Blue Lab Grown Diamond Engagement Ring – Cushion Cut Hidden Halo
A 2.5-carat fancy blue lab grown diamond, cushion-cut and set in a hidden halo design — handcrafted to order. Handcrafted in your choice of solid gold or platinum.
Made to order in 1–2 weeks · 30-day returns · Starting at $2180.00
| Center Stone | 2.5 ct Lab Grown Diamond, Fancy Blue, Cushion, VS (Best Only) Clarity, Excellent Cut |
| Center Stone Size | 8x8mm · Diamond size guide |
| Setting | Hidden Halo |
| Side Stones | Approximately 16 pavé round brilliants tucked beneath the center (~0.4 ct total) |
| Total Carat Weight | 2.5 ct center (accent carat varies by configuration) |
| Shank Width | 2.5mm |
| Metal Options | 10K, 14K, 18K Solid Gold, Platinum Pure |
| Metal Colors | Yellow, Rose, White Gold |
| Certification | IGI® or GIA® diamond grading report |
| Production | Handcrafted to order — 1–2 weeks |
| Included | Free insured worldwide shipping, lifetime warranty, 30-day returns |
Major retailers rarely stock natural blue diamond engagement rings, and when they do, prices start at $10,000–$30,000+ due to the extreme rarity of blue diamonds in nature. Mohana delivers IGI/GIA-certified lab grown blue diamonds at a fraction of that, handcrafted to your specifications, starting at $2180.00.
| Feature | Mohana Jewels | Brilliant Earth | Blue Nile | James Allen |
|---|---|---|---|---|
| Blue diamond options | Available in blue, pink, yellow, green | Mostly white only | White only | White only |
| Center stone | 2.5ct Cushion Fancy Blue VS (Best Only) | 1–2ct Cushion | 1–2ct Cushion | 1–2ct Cushion |
| Setting style | Hidden Halo | Standard Hidden Halo | Standard Hidden Halo | Standard Hidden Halo |
| Total carat weight | 2.5 ct+ | 1.5–2.5 ct | 1.5–2.5 ct | 1.5–2.5 ct |
| Shank width | 2.5mm | Not stated | Not stated | Not stated |
| Metal options | 10K / 14K / 18K + Platinum | 14K / 18K | 14K / 18K | 14K / 18K + Platinum |
| Made to order | Yes — handcrafted | Pre-made inventory | Pre-made inventory | Limited custom |
| Insurance on shipping | Included free | Separate purchase | Separate purchase | Separate purchase |
| Starting price | $2180.00 | $10,000+ | $9,000+ | $8,500+ |
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.
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.
Approximately 16 pavé round brilliants tucked beneath the center (~0.4 ct total). For exact stone count on your specific configuration, our craft team can confirm before production — contact customer support.
The shank (the band around your finger) measures 2.5mm wide. At 2.5mm the band is slim enough to feel delicate on the finger while still substantial enough to support the hidden halo design. The shank width is consistent across all metal options.
The Mohana starts at $2180.00 in 10K solid gold and scales up with 14K, 18K, and platinum. A natural mined blue diamond of comparable size and saturation would cost $300,000 to $3M+.
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.
Yes — complimentary resizing within the first year. Full eternity bands are the exception due to their continuous diamond setting.
A ring of small diamonds tucked just beneath the center stone — invisible from above, but a hidden flash of light from the side.
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.
Each ring is handcrafted to order in 1–2 weeks, then ships free worldwide with full insurance.
Yes — contact our team through customer support to request a custom variation in a different carat, shape, or metal combination.
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