Purple & Violet Diamonds

Introduction

Purple and violet diamonds are often spoken of together, and for good reason — they are visually adjacent, commercially intertwined, and both extremely rare. But they are not the same colour, and GIA does not treat them as such. On the gemological colour wheel, purple sits between red and blue, closer to red. Violet sits between purple and blue, closer to blue. The distinction matters because the colours likely arise from different mechanisms within the crystal, and the market prices them differently.

Together, purple and violet form the second rarest colour family in the diamond world, surpassed only by red. Most collectors will never see a saturated natural purple diamond in person. Those who do are looking at a stone whose colour was likely created by the same extreme forces — plastic deformation of the crystal lattice — that produce pink and red, taken to a different point along the spectrum of structural distortion.

Key Points

Two Hues, Two Causes

GIA treats purple and violet as distinct hue positions, and the available evidence suggests they originate from different physical mechanisms:

Purple diamonds are primarily associated with plastic deformation — the same crystal distortion that produces pink, red, and brown diamonds. During formation deep in the earth's mantle, extreme pressure and temperature cause the diamond lattice to deform along crystallographic planes, creating a network of defects called graining. In pink diamonds, this selective absorption produces pink. When deformation reaches particular conditions — not yet fully characterised by science — the absorption shifts to produce purple.

Violet diamonds are more often associated with hydrogen defects. GIA has documented hydrogen-rich diamonds from the Argyle mine in Australia that display a range of gray-to-blue-to-violet colours. In these stones, hydrogen replaces carbon atoms in the lattice, creating defect centres that absorb selectively in the yellow-green region and transmit violet. Some violet diamonds are also Type IIb (boron-bearing), which means their colour involves a combination of boron-related absorption and other defect contributions.

The distinction is not always clean. Some stones show characteristics of both mechanisms, and the science of purple and violet diamond colour is less settled than for blue (boron) or yellow (nitrogen), where the cause is well understood. What is clear: calling a violet diamond "purple" or vice versa is not a matter of casual naming — it reflects a different position on the colour wheel, a likely different cause, and a different GIA grade.

Rarity in Context

Natural purple diamonds are rarely encountered in the trade. Most fancy colour dealers will go years between significant purple stones. Violet is rarer still as a primary hue — more commonly seen as a modifier on blue or gray diamonds ("violetish blue," "grayish violet") than as the dominant hue description.

The rarity compounds at higher saturation grades. While Fancy Light Purple or Fancy Purple stones are themselves uncommon, Fancy Deep Purple and Fancy Vivid Purple are extraordinary. The number of natural diamonds that have received these top grades from GIA is small enough that individual stones are known within the trade.

Sources: Argyle and Siberia

Two sources have contributed the most documented purple and violet diamonds:

The Argyle mine in Western Australia, which closed in November 2020, was the world's primary source of pink diamonds and also produced notable violet and purple stones. GIA's research on Argyle output documented hydrogen-rich diamonds spanning gray, blue, and violet hues. The mine's closure has tightened supply of all rare colours it produced, including purple and violet.

Siberian deposits in Russia have yielded natural purple diamonds that GIA documented in a dedicated study. These Siberian stones showed colour linked to plastic deformation rather than hydrogen — supporting the distinction between the deformation-driven purple and hydrogen-driven violet mechanisms. The Siberian purple diamonds were typically small (under 1 carat) but provided valuable scientific data on the colour's origin.

GIA Grading

Purple and violet diamonds are graded on the standard fancy scale. Common descriptions include:

• Fancy Light Purple, Fancy Purple, Fancy Intense Purple, Fancy Deep Purple, Fancy Dark Purple
• Fancy Violet, Fancy Grayish Violet, Fancy Dark Violet
• Modified descriptions: Pinkish Purple, Bluish Violet, Grayish Violet

The modifier structure reflects the colour wheel positions. Purple stones often carry pink or brown modifiers (reflecting the deformation mechanism they share with pink and brown diamonds). Violet stones more frequently show gray or blue modifiers (reflecting their proximity to blue on the colour wheel and, in hydrogen-rich examples, the gray component that hydrogen can introduce).

Market and Value

Purple and violet diamonds trade at high premiums but in an extremely thin market. There are too few transactions at any given grade to establish reliable benchmark prices in the way that yellow or even blue diamond pricing can be referenced.

What can be said:

• Pure purple at Fancy Intense or Fancy Vivid trades at prices comparable to strong pink — these are stones whose rarity rivals or exceeds pink at equivalent saturations.
• Violet stones, particularly those with attractive modifiers (violetish blue rather than grayish violet), can command significant premiums for their unusual colour character.
• Modified purples (brownish-purple, grayish-purple) are more available and trade at lower levels, though still well above brown or yellow.

The thinness of the market means that individual stones are priced on their own merits. Auction results, when they occur, are treated as landmark events rather than data points in a trend.

A Note on Verification

Some purple and violet diamonds in the public eye carry disputed provenance or unverified grading claims. The diamond trade has seen stones promoted with dramatic names and extraordinary colour descriptions that were not substantiated by GIA or other major laboratory reports.

For buyers, the rule is straightforward: a GIA Colored Diamond Report is the minimum standard. The report should state the colour grade (including any modifiers), confirm natural colour origin, and identify the diamond type. Without this documentation, a purple or violet diamond's colour claims cannot be independently verified, and the stone's value cannot be reliably assessed.

Frequently Asked Questions

What is the difference between purple and violet diamonds?

Purple and violet are distinct hues on the GIA colour wheel. Purple sits closer to red, while violet leans toward blue. They likely arise from different mechanisms: plastic deformation for purple, hydrogen or boron defects for violet. GIA grades them separately, and the market prices them differently.

How rare are purple diamonds?

Natural purple diamonds are considered the second rarest colour family after red. Most fancy colour dealers go years between significant purple stones. Fancy Deep Purple and Fancy Vivid Purple grades are extraordinarily scarce, with individual stones known within the trade.

Where do purple and violet diamonds come from?

The two main documented sources are the Argyle mine in Western Australia (closed November 2020), which produced notable violet and purple stones, and Siberian deposits in Russia that yielded deformation-driven purple diamonds studied by GIA.

How much are purple diamonds worth?

Pure purple at Fancy Intense or Fancy Vivid trades at prices comparable to strong pink — among the highest in the fancy colour market. The market is so thin that individual stones are priced on their own merits rather than against established benchmarks.

Do I need a GIA report for a purple diamond?

Yes, a GIA Colored Diamond Report is the minimum standard. It confirms the colour grade, any modifiers, and natural colour origin. Without this documentation, a purple or violet diamond's colour claims cannot be independently verified.

Related Reading

• Blue Diamonds — Violet's neighbour on the colour wheel, caused by boron rather than hydrogen.
• Brown Diamonds — Shares the plastic deformation colour mechanism with purple diamonds.
• Color Rarity & Certification — How GIA grades and certifies rare fancy colours like purple and violet.
• Matching Fancy Colors — The extraordinary challenge of finding matched pairs in rare colours.
• Fancy Color Market — How rarity maps to price across the colour spectrum.

Summary

Purple and violet diamonds represent the second rarest colour family after red. GIA treats them as distinct hues — purple closer to red, violet closer to blue — with likely different causes: plastic deformation for purple, hydrogen defects for violet. Major sources include the now-closed Argyle mine and Siberian deposits, both of which have contributed to the scientific understanding of these colours. The market is thin, prices are high, and individual stones are evaluated on their own merits. A GIA report confirming natural colour origin is essential for any purple or violet diamond purchase.