18K Solid Gold Lab-Grown Diamond Round Brilliant Ring, 5-8 Carat

Quick facts: IGI certified · E colour / VVS2 clarity · 18K solid gold · 60-day free returns · Free worldwide DHL delivery
More: Lab Grown Diamond Rings · Lab Grown Diamond Jewelry · How to find your ring size
The round brilliant, cut the way it was meant to be cut, in a plain four-prong solitaire. Choose your centre stone from 5 to 8 carat. No halo, no pavé, nothing to distract from the stone — at this size the ring does not need help.
Every centre stone is graded E colour and VVS2 clarity — colourless, with inclusions that take magnification to find — and comes IGI certified, with the certificate shipped alongside the ring.
Made to order in 18K solid gold: yellow, white or rose. Solid gold throughout, never plated.
Choose your carat:
5 Carat — $3,899
6 Carat — $4,699
7 Carat — $5,799
8 Carat — $7,299
Product Details:
Metal: 18K Solid Gold (Available in White, Rose and Yellow Gold)
Diamond: Lab-grown diamond, E colour, VVS2 clarity, 5.00ct to 8.00ct
Shape: Round Brilliant
Setting: Four-prong solitaire
Certifications: IGI Certified & BIS Hallmarked
Shipping Time: 4 business days to make and dispatch, plus about 4 business days in transit (around 8 business days total)
Customer Support: Available via live chat and video calls.
Frequently Asked Questions
How much does a large lab-grown diamond ring cost in solid gold?
At The Karat Store this ring runs from $3,899 for a 5 carat up to $7,299 for an 8 carat, all in 18K solid gold, never plated.
Is a lab-grown diamond a real diamond?
Yes. A lab-grown diamond is chemically and physically the same material as a mined diamond, graded on the same scale by the same laboratories. The only difference is how it was formed.
How big does a 5 to 8 carat round diamond look on the hand?
A 5 carat round measures roughly 11mm across and a 8 carat around 13mm, so it covers most of the width of an average finger. These are statement sizes rather than everyday ones.
Why is this offered only in 18K gold?
At these carat weights the diamond accounts for most of the value, so a lower gold purity saves very little. 18K gives the richest colour and the best setting for a stone of this size.
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 jeweller for an accurate measurement.
Ring Silhouette: Solitaire
Available Metal Colours: Yellow Gold, White Gold, Rose Gold
Metal Karat: 18K