Metal
Choose the setting metal and colour.
935 Argentium Silver
Platinum
6K Solid Gold
10K Solid Gold
14K Solid Gold
18K Solid Gold
Forever For Love
4.3 Ct IGI Certified Radiant Lab Diamond with Marquise Side Stones Engagement Ring
Radiant Lab Diamond with Marquise Side Stones in Gold & Platinum
Regular price
£1,000.00 GBP
Regular price
Sale price
£1,000.00 GBP
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935 Argentium Silver / Moissanite Brilliant Cut / 1Ct
Order today to get by Jul 13 - Jul 15
Returns & exchanges accepted within 14 days
Free Worldwide Shipping
- IGI/GIA Certified*
- Lifetime Warranty
- Secure Checkout
GIA / IGI certification applies only to natural and lab diamonds over 0.7cts.
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Selected configuration
- US 4
- US 4.5
- US 5
- US 5.5
- US 6
- US 6.5
- US 7
- US 7.5
- US 8
- US 8.5
- US 9
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Custom design
Looking for something different?
Any metal. Any gemstone. Any words inside the band. Tell us what you have in mind - we'll make it real.
Ready to order the 4.3 Ct IGI Certified Radiant Lab Diamond with Marquise Side Stones Engagement Ring? Review the selected configuration below before adding it to cart; it updates as you choose the metal, gemstone and centre stone size above.
- StyleRadiant three-stone
- SettingThree-stone setting with marquise sides
- Centre stone shapeRadiant
- Gem stoneMoissanite Brilliant Cut
- Metal935 Argentium Silver
- Centre stone carat weight1 ct (≈ 7.0 × 5.0 mm)
Each piece is handcrafted to order by Forever For Love in the metal, stone and carat size you choose.
Available to customise
Choose the combination that suits your piece
Your selected options update above with the product price. These are the standard choices available for this design.
Gemstone
Pick the centre stone type for your preference.
Moissanite Brilliant Cut
Moissanite Crushed Ice
Diamanite
Lab Diamond
Natural Diamond
Center Stone Carat Size
Pick the centre stone size for the look you want.
1Ctct
1.5Ctct
2Ctct
2.5Ctct
3Ctct
3.5Ctct
4Ctct
4.5Ctct
5Ctct
5.5Ctct
6Ctct
6.5Ctct
7Ctct
7.5Ctct
8Ctct
Compare available centre stones
Compare the available centre stone options
Every centre-stone option you can choose for this design, side by side. Your selected stone is the one chosen above in the buy zone.
| Centre Stone Option | Stone type | Mohs Hardness | Refractive Index | Price Tier | Certification | Best Suited For |
|---|---|---|---|---|---|---|
| Moissanite Brilliant Cut | Moissanite | 9.25 / 10 | 2.65 – 2.69 | Accessible | FFL authenticity documentation | Classic brilliant-cut sparkle with strong fire and durability. |
| Moissanite Crushed Ice | Moissanite | 9.25 / 10 | 2.65 – 2.69 | Accessible | FFL authenticity documentation | A crushed-ice sparkle profile within the moissanite options. |
| Diamanite | Store-defined gemstone option | Store-defined | Store-defined | Selectable option | Store-defined | Buyers choosing the store-defined Diamanite option. |
| Lab Diamond | Lab-grown diamond | 10.0 / 10 | 2.42 | Premium | IGI Certified Grading Report | Real diamond optical and physical properties with independent grading. |
| Natural Diamond | Natural diamond | 10.0 / 10 | 2.42 | Premium investment | GIA/IGI Certified Grading Report | Traditional natural diamond origin and heirloom value. |
Metal guide
Compare the available metals
Every metal offered for this design, compared on what actually matters: composition, colour, durability and who it suits best.
6K Solid Gold25% gold (6 of 24 parts)Palest, most subtle gold toneHigh alloy content makes it a hard-wearing, low-maintenance choiceReal solid gold at the most accessible level
10K Solid Gold41.7% gold (hallmark 417)Lighter, cooler gold toneThe hardest of the standard karats — excellent for daily wearEveryday durability at the best gold value
14K Solid Gold58.3% gold (hallmark 585)Classic, warm gold colourThe proven balance of durability and richness for rings worn every dayThe most popular choice for engagement rings
18K Solid Gold75% gold (hallmark 750)Richest, deepest gold colourSofter than 14K — wears beautifully with a little extra careA luxurious, traditional fine-jewellery feel
Platinum95% pure platinum (Pt950)Naturally white — never needs re-platingDense and durable; develops a soft satin patina over timeSensitive skin (hypoallergenic) and heirloom pieces
935 Argentium Silver93.5% silver — purer than sterling 925Bright white lustreMore tarnish-resistant than standard sterling; softer than gold or platinumAn accessible entry into a handcrafted design
Choosing between 10K, 14K and 18K gold
The lower the karat, the higher the share of harder alloy metals: 10K resists scratches best and costs the least, 18K gives the deepest gold colour with a softer surface, and 14K is the most popular middle ground for rings worn daily.
Gold and silver colour finishes — yellow, white or rose — are chosen as an order customisation on this page; they are finish options, not separate variants.
About this design
Common questions
Where can I buy a 4.3 ct radiant lab diamond engagement ring?
You can buy this radiant lab diamond three-stone ring directly from Forever For Love. Each ring is handcrafted to order in your selected metal, centre stone and carat size, with free insured worldwide shipping.
Is the lab diamond in this ring certified?
Yes — the Lab Diamond option is IGI-certified and the Natural Diamond option comes with GIA or IGI certification where available. Moissanite and Diamanite options include the store's authenticity documentation.
What is a three-stone ring good for?
Three-stone rings symbolise past, present and future, with the centre stone as the focal point and side accents adding elegance and visual interest.
How long does it take to receive this ring after ordering?
Each ring is made to order and typically arrives within 8–10 days of purchase. Every order ships with free insured worldwide delivery and 14-day returns.
Does this ring come with a warranty?
Yes — it is covered by our limited lifetime warranty, which includes free professional cleaning and prong tightening for life, plus one free resize within the first year.
Which metals is the 4.3 ct igi certified radiant lab diamond with marquise side stones engagement ring available in?
It is available in 935 Argentium Silver, Platinum, 6K Solid Gold, 10K Solid Gold, 14K Solid Gold, 18K Solid Gold. Gold and silver pieces can also be finished in different colours (such as yellow, white or rose) — the colour is chosen as an order customisation rather than a separate variant.
What centre stone carat sizes are available?
Centre stone sizes run from 1 ct to 8 ct. As a size guide: 1 ct ≈ 7.0 × 5.0 mm · 1.5 ct ≈ 7.8 × 5.6 mm · 2 ct ≈ 8.5 × 6.2 mm · 2.5 ct ≈ 9.2 × 6.6 mm · 3 ct ≈ 9.7 × 7.0 mm · 3.5 ct ≈ 10.2 × 7.4 mm · 4 ct ≈ 10.7 × 7.7 mm · 4.5 ct ≈ 11.1 × 8.0 mm · 5 ct ≈ 11.5 × 8.3 mm · 5.5 ct ≈ 11.9 × 8.6 mm · 6 ct ≈ 12.2 × 8.8 mm · 6.5 ct ≈ 12.6 × 9.1 mm · 7 ct ≈ 12.9 × 9.3 mm · 7.5 ct ≈ 13.2 × 9.5 mm · 8 ct ≈ 13.5 × 9.7 mm.
What is the total carat weight of this ring?
Total carat weight is your chosen centre carat plus 0.3 ct of accent stones — for example, a 1Ct ct centre comes to 1.3 ct in total. The figure on this page updates with your selected configuration.
Quick glance
From a 1 ct everyday solitaire look to a 8 ct statement ring, configure this radiant three-stone in your preferred metal and centre stone before checkout. Includes Free insured worldwide shipping. Lifetime warranty support is shown below.
- Metal options available935 Argentium Silver · Platinum · 6K Solid Gold · 10K Solid Gold · 14K Solid Gold · 18K Solid Gold
- Gemstone options availableMoissanite Brilliant Cut · Moissanite Crushed Ice · Diamanite · Lab Diamond · Natural Diamond
- Center Stone Carat Size options available1Ct · 1.5Ct · 2Ct · 2.5Ct · 3Ct · 3.5Ct · 4Ct · 4.5Ct · 5Ct · 5.5Ct · 6Ct · 6.5Ct · 7Ct · 7.5Ct · 8Ct
- Colour finishesGold in yellow, white or rose; silver finishes including yellow silver — chosen as an order customisation, not separate variants
- WarrantyLifetime
- ShippingFree insured worldwide
- CertificationIGI/GIA certification applies to diamond options
-
Center stone shapesCustomise this design
Available for customisation
Looking for one of the shapes below, or something different? We can customise it for you.
Certified standards
The 4Cs Diamond Grading Standards
Every diamond selected for our custom rings meets strict expert specifications. Here is how we grade each characteristic.
Excellent to Ideal Cut
The cut determines a diamond's brilliance, fire, and scintillation. It is the most critical factor of the 4Cs.
We craft our rings exclusively with Excellent to Ideal Cut stones. This ensures maximum light refraction, giving the center diamond its characteristic intense sparkle that reflects from across a room.
- Proportions: Cut to exact mathematical angles to return maximum light to the eye.
- Symmetry: Perfect facets alignment for a balanced, harmonious reflection pattern.
- Polish: Smooth mirror-like surface finish preventing any light diffusion.
GIA / IGI Standard
D-F Colorless Grading
Color refers to the presence or absence of trace tint within the diamond, graded from D (colorless) to Z (light yellow).
Our lab-grown diamonds are graded in the elite D, E, and F colorless range. To the naked eye, these stones are completely ice-white, ensuring that your ring reflects pure light without any distracting warm or yellow hues.
- D Grade: Completely colorless. The absolute highest tier of diamond purity.
- E-F Grade: Colorless. Traces of color are invisible except under microscope comparisons.
- Setting Match: Colorless stones look exceptionally brilliant set in white gold or platinum claws.
Colorless Range
D-F represents the premium colorless bracket certified by GIA/IGI.
VS1 to VS2 Clarity
Clarity measures the purity of the diamond, observing microscopic inclusions inside the stone or blemishes on the surface.
We offer VS1 to VS2 (Very Slightly Included) diamonds. These stones are guaranteed to be 100% "eye-clean" — meaning any minor microscopic inclusions are completely invisible to the naked eye under normal viewing conditions.
- Eye-Clean Guarantee: No visible spots, clouds, or feathers. Pure crystal look.
- Light Transmission: Clear paths for light rays, preventing any loss of luster.
- Value Optimization: VS grades provide the perfect intersection of absolute visual purity and optimal value.
Eye Clean Standard
VS1-VS2 represents microscopic inclusions only; completely eye-clean.
Precision Carat Scaling
Carat measures the physical weight of the diamond. 1.0 carat is equivalent to 200 milligrams.
We configuration-scale our rings to maintain perfect design proportions across all carat sizes (from 1.0 ct up to 8.0 ct). As the center stone increases, the accent diamonds in the hidden halo are adjusted in scale to keep the ring looking balanced.
- Millimeter Equivalence: Carat is weight, but shape affects measurements. For example, a 1.0 ct round diamond is approx. 6.5mm in diameter.
- Proportional Accents: Accent weight updates automatically based on the center stone to preserve geometry.
- True-to-life Simulator: Use our carat visualizer slider above to see real finger dimensions.
Proportional Scales
1.0 ct (6.5mm)
2.0 ct (8.2mm)
3.0 ct (9.3mm)
GIA Certificate*
Natural Diamond
Report: GIA #2486903721
Shape: Round Brilliant
Carat: 1.50 ct
Grading: E / VS1 / Excellent
IGI Certificate*
Lab Grown Diamond
Report: LG #612479528
Shape: Round Brilliant
Carat: 2.05 ct
Grading: F / VS2 / Ideal
Independent Grading
GIA* & IGI* Certified Diamonds
Every single diamond center stone we offer is independently graded and certified. Natural diamonds are graded by the Gemological Institute of America (GIA), while our lab-grown diamonds are certified by the International Gemological Institute (IGI).
* GIA / IGI certification applies only to natural and lab diamonds over 0.7cts.
Sizing
Ring Size
All our rings come in US ring sizes. If you don't know your US ring size, please see our conversion chart and tips on finding which size you wear.
THE DIFFERENTIATOR
What Sets Us Apart
Direct to You
Fine craftsmanship without middlemen.
GIA Certified
Every diamond certified by experts.
Expert Craftsmanship
True Scale & Proportions
Lifetime Warranty
Protected for generations to come.
Bespoke Design
One-of-a-kind pieces for your vision.
Premium Quality
Handcrafted with the finest materials.
Sustainable
Ethically sourced materials.
Secure Checkout
Safe and encrypted transactions.
Flexible Payment
Pay later with Klarna.
Free Shipping
Insured worldwide delivery.
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