GIA Certified Diamonds

Goldsmiths strive to source the finest diamonds for our jewellery pieces, and to that end, we aim to incorporate, where possible, independent assessments for a selection of precious stones. We work with independent institutions to provide detailed reports on a select number of stones, including the Gemological Institute of America (GIA), the global authority on diamonds, who rank our finest diamonds according to the “Four C’s” - a diamond’s cut, colour, clarity and carat. These detailed assessments from the GIA and other institutions enable you to make a well-informed decision on your diamond purchase. Browse our certified diamond range below to find the perfect sparkling gift, with the peace of mind that comes with independent certification.

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73 Products
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  • £1,001 - £2,500 (6)
  • £2,501 - £5,000 (30)
  • £5,001 - £10,000 (24)
  • Over £10,000 (13)
Discount (% OFF)
  • 20% - 29% Off (1)
  • 30% - 39% Off (2)
  • 40% - 49% Off (1)
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  • Rings (65)
  • Necklaces (6)
  • Earrings (2)
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The Watches of Switzerland Group operates a network of retail stores, including Goldsmiths, Mappin & Webb, and the Watches of Switzerland.

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