Purple Lab Grown Fancy Diamonds

What makes a purple lab grown diamond different from other fancy colours?

Purple lab grown diamonds are among the rarest fancy colour expressions produced in a controlled growth environment. The violet-to-purple range is caused by the presence of hydrogen during crystal formation — the same mechanism responsible for natural purple diamonds, replicated in laboratory conditions using CVD or HPHT processes. Unlike yellow or blue lab grown fancy diamonds, which are produced in greater commercial volume, purple sits at the lower-frequency end of the visible spectrum and requires precise atmospheric control to achieve consistent saturation. Stones are graded using the same GIA, HRD or IGI colour-grading scale applied to natural fancy diamonds, with descriptors ranging from Fancy Light Purple through to Fancy Deep or Fancy Vivid. Stronger saturation commands a higher per-carat price even in lab grown form.

How to choose a setting and metal for a purple lab grown diamond

The right setting draws out purple's cooler, violet undertones without competing with them. Rose gold in 9ct, 14ct or 18ct adds warmth that contrasts the stone's blue-violet character, creating a complementary rather than matching effect. White gold and platinum provide a neutral frame that allows the purple lab grown diamond's colour to read clearly without interference. Yellow gold can work well with deeper, warmer purple specimens but can push lighter stones toward grey. For setting style, a bezel or low four-claw solitaire keeps the colour as the focus, while a halo of colourless lab grown melee adds visual weight without introducing competing hues. Oval and cushion shapes tend to retain body colour more visibly than brilliant-cut rounds at equivalent carat weights.

What does a purple lab grown diamond cost in the UK?

Purple lab grown fancy diamonds are priced significantly below their natural equivalents while delivering equivalent certified colour grades. Cost is driven by three variables: colour grade (Fancy Vivid commands a meaningful premium over Fancy Light), carat weight, and cut quality — with well-proportioned stones carrying better light performance and therefore higher values. Lab grown fancy coloured diamonds in purple occupy a small production segment, so they do not follow the broad price compression seen in colourless lab grown stones; rarity of the colour modifier keeps pricing firmer. For context, Bridebook's 2026 UK average engagement ring spend of £2,247 covers a mid-weight purple lab grown diamond with setting at the lighter saturation grades. Vivid and deeper specimens with strong clarity grades sit considerably higher.

Are purple lab grown fancy diamonds certified to the same standards as natural stones?

Every purple lab grown fancy diamond in our inventory is certified by GIA, HRD or IGI — the same three independent laboratories that grade natural fancy colour diamonds. The certificate records origin (laboratory grown), colour grade, clarity, cut grade where applicable, and carat weight. For fancy colour stones, the colour section of the report is particularly detailed, noting hue, tone and saturation descriptors that determine grade. When a purple lab grown diamond is set into one of our rings, the finished piece is then hallmarked at the London Assay Office, confirming metal purity. The stone's independent certificate travels with it from purchase through to setting.

Caring for a purple lab grown diamond

Purple lab grown diamonds share the physical properties of all diamonds — a Mohs hardness of 10, making them the hardest known material and fully suited to daily wear in any setting style. The colour in a lab grown purple diamond is structural, locked into the crystal lattice during growth; it does not fade, alter or require treatment maintenance. Routine care is straightforward: a soft brush with mild soap and warm water removes oils and surface deposits. Ultrasonic cleaners are safe for most purple lab grown diamond settings, though stones set in pavé or micro-claw arrangements should be checked by a jeweller periodically. Our rings carry a lifetime warranty covering setting integrity.