3.00ct Old Mine Cushion Lab Grown Diamond Solitaire Engagement Ring | IGI Certified | Unii Jewels

Classic solitaire simplicity meets antique-inspired diamond character in the Unii Jewels 3.00ct Old Mine Cushion Lab Grown Diamond Solitaire Engagement Ring.

At the center is a substantial 3.00ct Old Mine Cushion Lab Grown Diamond, offered in the supplied D-E-F color and VVS-VS clarity ranges, with an Excellent cut specification and IGI certification.

Because the entire 3.00CT total diamond weight is concentrated in a single center stone, the ring maintains a true solitaire hierarchy. There are no supplied side diamonds, pavé accents or halo stones competing with the center. The visual identity comes directly from the Old Mine Cushion shape, its substantial scale and the refined proportions of the 2mm band.

💎 Diamond Details

Total Diamond Weight: 3.00CT
Diamond Type: Lab Grown Diamond
Diamond Shape: Old Mine Cushion
Carat Weight: 3.00CT
Diamond Color: D-E-F
Diamond Clarity: VVS-VS
Cut: Excellent
Certification: IGI Certified

💍 Ring Details

Style / Design: Solitaire
Product Type: Solitaire Engagement Ring
Band Width: 2mm
Metal Options: Silver, Gold, Platinum
Wear: Engagement, wedding, anniversary, special occasions and fine-jewelry wear

The Design Story — Old-World Character, Modern Simplicity

From a jewelry designer's perspective, the appeal of this ring comes from allowing a distinctive center shape to do almost all of the visual work.

An Old Mine Cushion combines the softness associated with Cushion geometry with an antique-inspired personality. Rather than surrounding that character with additional diamond shapes, the solitaire format gives the center stone enough visual space to remain completely recognizable.

At 3.00ct, the diamond also carries enough scale to establish a strong presence without relying on a halo to increase the overall appearance.

The design hierarchy remains beautifully simple:

Refined 2mm Band → Solitaire Setting → 3.00ct Old Mine Cushion

Why a 3.00ct Old Mine Cushion Makes a Strong Centerpiece

Increasing the center from a smaller Cushion to 3.00ct changes the visual relationship between diamond and band.

The diamond becomes the dominant architectural element of the ring.

Its larger face creates greater visual presence, while the Cushion-derived outline prevents the design from feeling excessively rigid or geometric.

This combination of substantial scale and softened geometry gives the ring a distinctive balance between boldness and refinement.

Cushion Softness + Structured Form

One of the reasons Cushion-shaped diamonds remain distinctive is the way they combine different geometric qualities.

The outline has recognizable corners, but those corners are softened rather than sharply squared.

The sides provide structure, while the curved transitions prevent the silhouette from feeling severe.

This creates an appealing middle ground between the circular symmetry of a Round diamond and the sharper architecture of shapes such as Princess or Emerald.

With an Old Mine Cushion, that geometry also carries a more antique-inspired visual identity.

100% of the Diamond Weight in One Center Stone

The supplied total diamond weight is 3.00CT, and the supplied center diamond is also 3.00CT.

That means the full diamond weight is concentrated in one focal stone.

From a design standpoint, this is important because there is no secondary hierarchy to manage.

There is no:

Center + Halo
Center + Side Stones
Center + Pavé

Instead, the concept remains:

One Diamond → One Focal Point

This is the defining strength of a solitaire.

Why the 2mm Band Works

The 2mm band creates deliberate contrast with a substantial 3.00ct center.

Rather than matching the visual weight of the diamond with an unnecessarily heavy shank, the refined band acts as a supporting foundation.

This allows the center stone to appear even more prominent while preserving an elegant overall profile.

The relationship becomes:

Fine Metal Foundation → Large Old Mine Cushion Center

That difference in scale helps emphasize the diamond without adding additional decorative elements.

Solitaire Without Visual Distraction

A Halo can enlarge the overall diamond-covered footprint.

Pavé can extend brilliance along the band.

Side stones can create additional horizontal width.

A solitaire takes the opposite approach.

It removes those competing elements so the viewer notices the shape, scale and individual character of the center diamond first.

That approach is particularly effective with an Old Mine Cushion because the center stone already has a distinctive identity worth showcasing.

Why Choose This 3ct Old Mine Cushion Solitaire?

This design is particularly suited to someone who appreciates antique-inspired diamond character but prefers a clean, contemporary ring composition.

The Old Mine Cushion supplies the personality.

The 3.00ct scale supplies the presence.

The solitaire design supplies the simplicity.

And the 2mm band provides a refined foundation without competing for attention.

Rather than using additional diamonds to make the ring visually complex, the design allows one substantial center stone to carry the entire composition.

The result is a 3.00ct solitaire engagement ring where Old Mine Cushion character, substantial center-stone presence and a refined 2mm foundation create a clean balance between antique-inspired personality and modern simplicity.

🔄 30-day return and refund policy for peace of mind

✅ Fully insured and tracked shipping via UPS & USPS
⏱️ Handcrafted with care,9-10 days production time🌍 Worldwide delivery in 8-10 business daysafter production

Please read the Shipping Policy for more information.

✓ Ethical & Conflict-Free – Grown in labs with zero mining impact

✓ IGI Certified Quality – Independently verified for clarity, color, and carat

✓ No BGM Stones – Guaranteed no brown, green, or milky undertones

✓ Eco-Friendly Luxury – Timeless beauty, sustainably made

✓ Ideal for Custom Jewelry – Engagement rings, wedding bands, and more

🌟Surat-Made Brilliance– Crafted in India’s diamond hub

💎Certified Sparkle– IGI-certified lab-grown diamonds

💸Unmatched Value– Low prices Diamond + low making charges

🖌️Truly Custom– Unique designs tailored for you

📦Worldwide Shipping– Fast, Free, insured, and reliable