Cosette Charles & Colvard Forever One Platinum Solitaire

£806.00 GBP


The Cosette solitaire features an intricate geometric basket detail complete with a secure 6 prong setting. This truly unique engagement ring is designed to raise your choice of stunning Charles & Colvard colourless D-F, Forever One Moissanite or our very own Lily Arkwright Lumoie moissanite up to dazzling heights for breathtaking shine.

Crafted in platinum, the main image features a 6.5mm Forever One round cut moissanite centre stone, which is equivalent in size to a 1ct carat diamond. 

Every Charles and Colvard Forever One moissanite stone that is featured on Lily Arkwright is 100% ethical and lab-grown in the United States. All centre stones are accompanied by a Charles and Colvard certificate of authenticity and a limited lifetime warranty. Each stone is carefully inspected and graded by a fully qualified gemologist.

Available Also in: 18k White Gold & 18k Two Tone Gold

Want to find out about a Hearts & Arrows upgrade? - Click Here


  • Centre Stone: Available from a 5mm - 8mm, set with Charles & Colvard or Lumoie Moissanite. Additional sizes available upon request.
  • Metal: Platinum 950
  • Band Width 2.3mm
  • Setting: 6 Prong Solitaire
  • This piece has been certified in accordance with the hallmarking Act 1973 

Customer Reviews

Based on 3 reviews

Cosette Moissanite 18k White Gold Solitaire

Hi Bendik, Thank you so much for reviewing your Cosette moissanite ring, we're thrilled you're happy with your purchase and hope to be of service again in the future. Thanks for choosing Lily Arkwright Lily Arkwright - UK Hallmarked, Assay Assured Online Jewellery Retailer, Moissanite, Lab Diamond & Gemstones Fine Jewellery, Global Shipping & 0% Interest Free Payments Available.
Such a nice design

Breathtaking design.

Thank you so much for taking the time to review your Lily Arkwright purchase. Your feedback helps spread the Lily Arkwright message and helps us continually improve to offer the very best service. Lily Arkwright - UK Hallmarked, Assay Assured Online Jewellery Retailer, Moissanite, Lab Diamond & Gemstones Fine Jewellery, Global Shipping & 0% Interest Free Payments Available.
Thrilled with my ring

I am absolutely thrilled with my ring, it looks perfect! I was devastated to lose my engagement ring last year, but eventually accepted that it was time to find a replacement. Having lost one engagement ring, I decided against another diamond. However, I wanted something that was still good quality and would last - that's when I came across moissanite. Lily Arkwright have been brilliant right from the start. I wanted a slight alteration made to one of their designs, and they were so helpful and accommodating. Nothing was too much trouble and the communication was amazing the whole way through. I was a little nervous ordering jewellery online and as a result asked a lot of questions throughout the process but Sarah was so friendly and so quick to reply to all my emails and questions. My ring absolutely beautiful. I would 100% recommend them to anyone and I am sure I will shop with them again in the future. Thank you so much Lily Arkwright and to Sarah for her time and patience! :)

Hi Charlotte, Thank you for taking the time to review your shopping experience with Lily Arkwright, we’re so happy that we were able to help replace your lost engagement ring and it was a pleasure being of service. We pride ourselves on our moissanite engagement rings and the quality of our fine jewellery collections, it was a pleasure helping you choose the perfect engagement ring and we look forward to seeing you again soon. If you ever have any future queries, please don’t hesitate to get in touch. Lily Arkwright - UK Hallmarked, Assay Assured Online Jewellery Retailer, Moissanite, Lab Diamond & Gemstones Fine Jewellery, Global Shipping & 0% Interest Free Payments Available.

Delivery Charges

Lily Arkwright are proud to offer FREE UK & European Delivery..

  • UK: FREE Delivery; includes:  UK mainland, highlands, Jersey, Isle of Man, Northern Ireland, and the Republic of Ireland
  • Europe: FREE Delivery
  • International: £44

International customers are responsible for local customs and import charges. No customs and import duties are payable within the UK & EU VAT zone.

Delivery Timescales

We aim to dispatch all orders within 2 - 14 days, a small selection of products & bespoke design items do have an extended delivery timescale and can take up to 4 weeks for delivery Is your order urgent? Please get in touch with our customer care team and we'll do our upmost to expedite your order.

Loose Precious Gemstones are dispatched within 3 - 5 days.

Please contact us for further information, a signature is required upon receipt of all orders


We want to ensure that you are completely satisfied with your purchase from Lily Arkwright, and offer a 30-day money-back guarantee from the date your order arrives. The item must be returned in an unworn condition, with all original packaging.

We do not accept returns for engraved or bespoke design/personalised items.

UK Return Postage is FREE
  • EU and International customers are responsible for return postage costs.
  • When sending items back please ensure you obtain proof of postage.
  • Before returning your order please request a RETURNS NUMBER (RN) by emailing

Returns Address:

Lily Arkwright, Unit 11, 792 Wilmslow Road, Didsbury, Manchester, M20 6UG

Special Orders

All customised special orders have slightly extended delivery times. Please contact the Lily Arkwright customer service team for further information by emailing: and we will be happy to assist.

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