3 to 5 Carat Blue Lab Grown Diamond Engagement Ring · Oval Cut Hidden Halo | Selene
3 Carat / 10K Solid Gold / Yellow Gold
$3,860.00
Sale price
$3,860.00
Regular price
Skip to product information
3 to 5 Carat Blue Lab Grown Diamond Engagement Ring · Oval Cut Hidden Halo | Selene
$3,860.00
Sale price
$3,860.00
Regular price
An oval-cut fancy blue lab grown diamond engagement ring, available in 3, 4, or 5 carat — set as a six-prong solitaire with a hidden halo of six round accents. The Selene pairs the elongated grace of an oval center with a sleek tapered band and a halo of brilliance tucked discreetly beneath the basket, in your choice of solid gold or platinum.
- Three carat options — 3 ct (10x7mm), 4 ct (12x8mm), or 5 ct (13.5x9mm) fancy blue lab grown diamond
- Oval cut — elongated brilliant facet pattern, finger-flattering silhouette
- Hidden halo: Six round accent diamonds (1.30mm) nestled under the oval basket — only visible from side and top angles
- Six-prong setting — classic, secure, lets the oval breathe
- Band width: 2.5mm — slim tapered profile that elongates the finger
- IGI® or GIA® certified — independent grading report included
- Your choice of metal: 10K, 14K, 18K solid gold or platinum
- Free worldwide insured shipping + lifetime warranty
Made to order in 1–2 weeks · 30-day returns · Starting at $3860.00
Have questions about this ring?
Talk to a real diamond expert — we typically respond within 24 hours.
Contact us →
Full Specifications
| Specification | Detail |
|---|---|
| Center Stone | Lab Grown Diamond, Fancy Blue, Oval, VS Clarity, Excellent Cut — choose 3, 4, or 5 ct |
| Center Stone Size | 3 ct — 10x7mm 4 ct — 12x8mm 5 ct — 13.5x9mm Diamond size guide |
| Setting | Solitaire with Hidden Halo (six-prong) |
| Hidden Halo | Six round lab grown diamonds — 1.30mm each (0.06 ct total), nestled beneath the basket |
| Total Carat Weight | 3.06–5.06 ct (center + 0.06 ct hidden halo) |
| Band 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 |
Why Mohana
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.
About Blue Lab Grown Diamonds
Blue diamonds are among the most coveted natural gems in history. The 45.52-carat Hope Diamond (Smithsonian, ~$200–250M estimated value), the 14.62-carat Oppenheimer Blue (sold for $57.5M, then the most expensive diamond per carat ever auctioned), and the Wittelsbach-Graff Blue are among the most legendary. Natural fancy blue diamonds typically sell for hundreds of thousands per carat. Lab grown technology now makes blue diamonds accessible without that premium.
Mohana's blue lab grown diamonds are chemically, optically, and physically identical to mined blue diamonds — graded by the same IGI and GIA laboratories. The blue color comes from trace boron in the carbon lattice (the same mechanism as in natural blue diamonds, including the Hope), is part of the diamond's atomic structure, and will never fade.
Blue diamonds pair beautifully with white gold and platinum (cool-on-cool) or with yellow gold for a striking warm/cool contrast. Explore the full blue diamond collection.
Frequently Asked Questions
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 a hidden halo?
A hidden halo is a small circle of round accent diamonds set just below the gallery of the center stone — invisible when the ring is viewed straight-on from above, but adding sparkle and visual lift when viewed from the side or at an angle. The Selene hidden halo uses six 1.30mm round lab grown diamonds (0.06 ct total) tucked beneath the oval basket.
What carat options are available?
The Selene comes in three center stone sizes: 3 carat (10x7mm), 4 carat (12x8mm), and 5 carat (13.5x9mm). Choose your carat at the top of this page; the price updates per option.
How many side stones does this ring have?
Six round lab grown diamonds — 1.30mm each (0.06 ct total weight) — arranged as a hidden halo beneath the oval basket. For exact stone count on your specific configuration, our craft team can confirm before production — contact customer support.
What is the band width of this ring?
The band measures 2.5mm wide — slim and tapered to elongate the finger and let the oval center stand out. The band width is consistent across all metal and carat options.
How much does this blue lab grown diamond engagement ring cost?
Pricing scales with the carat you choose. Starting prices in 10K solid gold:
- 3 ct — starts at $3860.00 (10K solid gold)
- 4 ct — starts at $4850.00 (10K solid gold)
- 5 ct — starts at $5940.00 (10K solid gold)
14K, 18K, and platinum add roughly $200 per tier. A natural mined blue oval of comparable quality would cost $50,000+ to $800,000+.
Can this ring be resized?
Yes — complimentary resizing within the first year.
Why a six-prong setting on an oval?
Six prongs (two at each tip plus one on each side) give the oval extra security at the wider points and reinforce the silhouette, while still leaving the elongated stone and its brilliance fully on display.
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 for a custom variation in a different carat, shape, or metal combination.
Luxury Wedding Band Collection
CURATED COLLECTIONS
