3ct Radiant Cut Lab Grown Diamond Engagement Ring with Marquise Side Stones

This 3ct radiant cut lab grown diamond engagement ring features a 3.00 ct radiant centre and three 2x4mm marquise side stones. It is designed as an engagement ring with a visible, refined profile. You get a bold centre stone and elegant side detail that complements wedding band pairing. Available in platinum, 18K rose, or 18K yellow gold. Complimentary first resizing and a one year workmanship warranty included.

Why choose this 3ct Radiant Cut Lab Grown Diamond Engagement Ring

• You want a large radiant cut centre that reads true to size.

• You want verified lab grown diamond quality and traceable origin.

• You want side stones that add sparkle and profile without adding bulk.

• You want options: platinum, 18K rose gold, or 18K yellow gold.

Ring specifications – Why this engagement ring suits your proposal

• Centre stone: 3.00 carat radiant cut, lab grown diamond. Colour and clarity options available.

• Side stones: 6 pieces, marquise cut, 2x4mm each, set flush into the band.

• Setting: four-prong radiant centre, channel-set or bezel-set marquise sides (specify preference).

• Band width: 2.5 mm standard; custom widths available.

• Metals: platinum, 18K rose gold, 18K yellow gold, 9K white gold on request.

• Available sizes: US 3 to US 11.5. Resizing service included for the first year.

Centre stone details – How this engagement ring compares to other radiant cut engagement rings

• The radiant cut mixes trimmed corners with brilliant facets. It offers strong face-up brightness.

• Lab grown diamonds are chemically and optically identical to mined diamonds. They come with a lab report on request.

• Choose your colour and clarity grade based on budget and visual preference. We recommend a minimum of G-H colour and VS2-SI1 clarity for a clean face-up look at 3 carats.

• This engagement ring reads larger on the finger than many round or princess cuts. The radiant cut combines trimmed corners with brilliant facets for strong face-up brightness at 3 carats.
• The three marquise side stones add length and visual flow. Compared to halo or solitaire engagement rings, this three-stone style keeps a cleaner profile while offering more side sparkle.

Side stones and setting – Ring specifications for engagement ring buyers

• The three marquise side stones measure 2x4mm each. They run along the band near the centre.

• Marquise cuts elongate the centre and add subtle vintage flair.

• Choose channel set for a clean, modern line. Choose bezel or shared prong for more vintage character.

• We inspect each side stone for cut symmetry and secure fitting before shipping.

Metals, sizing, and customization

• Platinum gives the most durable setting and keeps the diamond colour neutral.

• 18K gold gives warmer tones if you prefer rose or yellow gold.

• You can request custom engraving on the inner band.

• If you want different side stones (moissanite, sapphire), we can quote a custom change.

Care, shipping, warranty, and resizing for engagement rings

• Clean with warm soapy water and a soft brush. Rinse and dry with a lint-free cloth.

• Avoid harsh chemicals and high-heat exposures.

• All rings include:

  • 1-year workmanship warranty.

  • Free standard shipping within South Africa.

  • Complimentary first resizing within 12 months.

Quality assurance and certification

• We provide a lab report for the centre stone on request. Ask for the certificate number at checkout.

• Lab grown diamonds are graded by the same standards used for mined diamonds.

• For more information on lab grown diamonds, see an external resource:

  • GIA on lab grown diamonds: https://www.gia.edu/lab-grown-diamonds

Questions and next steps

• Want help choosing colour and clarity? Contact our team for advice.

• Want to see this ring in a different metal? Request a sample render

• Ready to buy? Select your metal and size, then add to cart. We will confirm your lab report and production timeline.

• Is this ring sold as an engagement rings?
  Yes. This product is listed and sold as an engagement ring. We package it for proposals and include a lab report on request.

• Can you match a wedding band to this engagement rings?
  Yes. We offer matching wedding bands designed to sit flush with the marquise side stones. See our wedding bands page.

• Are these lab grown diamonds real diamonds?
  Yes. Lab grown diamonds are chemically and optically the same as mined diamonds. We provide a lab report on request.

• Do you ship to locations across South Africa?
  Yes. We ship nationwide. Free standard shipping applies within South Africa. Express options are available.

• What size and colour should I pick for a 3ct engagement rings?
  For best face-up balance at 3ct, choose G-H colour and VS2-SI1 clarity for value and visual purity.