3ct Oval Lab Diamond Cathedral Setting Ring

This cathedral oval lab diamond engagement ring features a raised setting that lifts the centre stone for added presence and light exposure. The cathedral shoulders provide extra support while drawing the eye toward the clean lines of the oval cut diamond.

This ring is made to order and fully customisable. You begin with this design as a base, then refine the details. A CAD design is created for your approval before any production begins.

Design details

• Oval cut lab grown diamond
• Cathedral-style setting for added height and support + diamond bridge for added sparkle
• Clean, structured lines that highlight the stone
• Balanced proportions for everyday wear

Stone size, setting height, and band width can be adjusted during the design stage.

RING SPECIFICATIONS

• 3.00cttw
• Oval Cut Lab Diamond
• IGI or GIA Fully Certified
• G Colour
• VVS2 Clarity
• Lab-Grown Diamonds

How your ring is made

• Choose this design as your starting point
• Review and approve your CAD design
• Your ring is crafted to order
• Secure insured delivery to your door

Typical turnaround is 4–6 weeks after design approval.

Metal options

• 9k, 14k, or 18k gold
• Yellow, white, or rose gold
• Platinum available on request

Why choose a lab grown diamond

• Visually identical to mined diamonds
• Durable and suitable for daily wear
• Better value for your budget

Start your custom ring

Use this design as is or customise it to suit your preferences. You will work directly with a jeweller and approve the design before production begins.

Why choose this Oval Cut Lab Diamond Ring

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

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

• You want a raised setting and profile without adding bulk.

• You want options: 9ct yellow, rose or white gold. Requests can be made for 18ct yellow, rose and white gold, or platinum.

Ring specifications – Why this engagement ring suits your proposal

• Centre stone: 3.00 oval cut lab grown diamond. Colour and clarity options available.

• Setting: 4 claw set with raised cathedral setting, with diamond bridge.

• Band width: 1.8mm standard; custom widths available.

• Metals: 9K rose gold, yellow gold, or white gold. 18K gold and platinum on request. Contact us here to enquire about a different metal

• Available sizes: US 5 to US 11.5. Resizing service included for the first year.

Centre stone details – How this engagement ring compares to other lab grown diamond engagement rings

• 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.

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

  • IGI on lab grown diamonds: https://www.igi.org/verify-your-report/

Lab Grown Diamond Engagement Rings South Africa: 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. Moissanite By Design 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.