Solid Gold Marquise Cut 3 ct Lab Grown Diamond Engagement Ring
The Karat Store · Handcrafted in Solid Gold
Whether it’s in shimmering gold, platinum or silver, it is the ring that symbolizes a woman’s engagement and is mostly adorned by her. Presenting the beautiful engagement ring – “18K Solid Gold Marquise Cut 3ct Lab Grown Diamond Engagement Ring” by The Karat Store. The center stone is a laboratory grown diamond that possesses a remarkable 3.0 carat in marquise cut accented with collection’s utmost clarity grade examined BDB.
The diamond is rated as VVS-VS clarity and E-F true color so that it puts at the very center of the ring a showpiece that is hard to turn your eye from. This is 18K Solid Gold band that comes in rose gold, yellow gold or white gold, and 18K Solid Gold can be forged if the need arises. The width and thickness of the band is 1.50 mm which is comparably slim yet sturdy enough to provide the wearer beauty and durability at the same time. The marquise cut is elongated with tapered ends and looks splendidly stunning and never-dies-stylishly making it a great classic for an engagement ring.
Here, at The Karat Store, we care for quality and design above all. Consequently, our lab-grown diamonds are ethically produced, and ecologically sound, as an alternative without degradation of aesthetics and quality. Finally, this Marquise Cut 3ct 18K Solid Gold Lab Grown Diamond Engagement Ring speaks for itself in its own designed beauty and the cause for which it has been designed.
Purchase today and you will not regret it, for you shall have a versatile yet elegant ring design that is neither outdated nor harmful to the environment.
Product Details:-
Frequently Asked Questions
How big does a 3 carat diamond look on the hand?
A 3 carat round diamond measures roughly 9.1mm in diameter — a noticeably large, statement-making center stone. Elongated shapes like oval, pear, or marquise can appear even larger for the same carat weight.
What's the price of this Marquise lab-grown diamond ring across different gold karats?
At The Karat Store, this Marquise lab-grown diamond ring starts at $2,839.2 in 10K gold, $3,203.2 in 14K gold, and $3,640 in 18K gold — all solid gold, not plated.
Should I choose 10K, 14K, or 18K gold for this ring?
18K gold (75% pure) has the richest color and softest feel. 14K gold (58.3% pure) is the most popular balance of durability and value. 10K gold (41.7% pure) is the most affordable and most scratch-resistant — a practical choice to pair with a 3 carat center stone.
Is this ring solid gold all the way through, or just gold-plated?
This ring is solid gold throughout, not gold-plated — the karat purity runs all the way through the metal. Unlike plated jewelry, it won't flake, discolor, or expose base metal over time, and it carries a karat hallmark stamp as proof of authenticity.
Can this ring be resized?
Yes. Select your ring size from the dropdown before checkout. If you're unsure of your size, we recommend visiting a local jeweler for an accurate measurement.
How do I clean and care for this ring so it lasts?
Clean every few weeks with warm water, a mild soap, and a soft brush, then dry thoroughly. Avoid chlorine, harsh chemicals, and ultrasonic cleaners for the gold setting, and store the ring separately to prevent scratching.
Ring Silhouette: Engagement ring
Available Metal Colours: Yellow Gold, White Gold, Rose Gold
Available Ring Sizes: US 2 to US 13 in quarter-size increments (45 sizes)
Explore more: Lab Grown Diamond Engagement Rings | Lab Grown Diamond Jewelry | Gold Rings | Marquise Cut Jewelry
Every piece is cast and finished by hand in genuine solid gold — choose 10ct, 14ct or 18ct in yellow, white or rose gold. Never plated, never filled, made to be worn for a lifetime.
Stones are conflict-free: lab-grown diamonds, moissanite and hand-selected natural gemstones, each set and polished by our artisans.
Your jewellery is crafted to order in your chosen gold colour, carat and size.
All ring sizes are shown in UK sizes (letters), and every size is the same price within each gold colour and carat. Half sizes (e.g. L½) are available in the size selector.
| UK | Inside diameter (mm) | Inside circumference (mm) |
|---|---|---|
| H | 14.7 | 46.1 |
| I | 15.1 | 47.4 |
| J | 15.5 | 48.7 |
| K | 15.9 | 49.9 |
| L | 16.3 | 51.2 |
| M | 16.7 | 52.5 |
| N | 17.1 | 53.8 |
| O | 17.5 | 55.0 |
| P | 17.9 | 56.3 |
| Q | 18.3 | 57.6 |
| R | 18.7 | 58.9 |
| S | 19.1 | 60.2 |
| T | 19.6 | 61.4 |
| U | 20.0 | 62.7 |
| V | 20.4 | 64.0 |
| W | 20.8 | 65.3 |
| X | 21.2 | 66.5 |
| Y | 21.6 | 67.8 |
| Z | 22.0 | 69.1 |
| Z+1 | 22.4 | 70.4 |
Not sure of your size? Measure the inside of a ring that already fits, use a ring sizer, or visit a local jeweller for a professional sizing. We are happy to help — get in touch before you order.
Remove your jewellery before swimming, cleaning or the gym. Clean gently with warm water, mild soap and a soft brush, then dry with a lint-free cloth. Store each piece separately to prevent scratches.
Solid Gold, Always
Crafted in genuine 10ct, 14ct or 18ct gold — never plated, never filled.
Made to Order
Handcrafted for you and dispatched within 4 working days.
Conflict-Free Stones
Lab-grown diamonds, moissanite and hand-selected gemstones.
Personal Guidance
Questions on ring size, gold or stones? We are here to help.
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