Periwinkle — A Light Violetish-Blue Trade Descriptor
Periwinkle — A Light Violetish-Blue Trade Descriptor
Informal trade language for pastel blue stones with a violet cast
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Periwinkle is a trade descriptor for a light violetish-blue hue, intermediate between pure blue and lavender. The term is used informally in the coloured-stone trade for sapphires, tanzanites, and occasionally spinels that show a pastel blue with a noticeable violet component. The descriptor is subjective and not standardised by any laboratory; its meaning depends on the speaker and the comparative range of the parcel at hand.
Where the term is used
Periwinkle most often appears in sapphire trading to describe pale, slightly violet-blue stones that fall outside the cornflower or royal blue references. The colour is reminiscent of the periwinkle flower, Vinca minor — a soft blue with a perceptible violet shift, lighter in tone than the saturated medium-blue of fine Burmese or Ceylon material. Periwinkle sapphires are most often encountered in Sri Lankan goods, where the geuda heat process and the natural distribution of light-toned rough produce many stones in this part of the colour space. East African sources, particularly Madagascar, also yield periwinkle blues, often with a slightly grey or steely cast that the trade adjusts for in pricing.
In tanzanite, the term is sometimes applied to lighter material that has retained a noticeable blue rather than tilting toward the deeper violet for which the species is best known. Pastel tanzanite — once dismissed as commercial off-cut — has carved out a market niche of its own, and periwinkle is an apt descriptor for the lighter end of the range. In spinel, the term is occasionally used for pastel blue-violet stones from Mahenge in Tanzania or from Sri Lankan secondary deposits, though the more common trade descriptor for those stones is simply lavender spinel or blue-violet spinel.
Position relative to other blue descriptors
The trade vocabulary for blue corundum runs roughly from cornflower (medium-light blue with mild violet cast, after the bloom of Centaurea cyanus), through royal blue (medium-dark, vivid blue), to Kashmir blue (the velvety, slightly milky blue associated with the Padar Valley material). Periwinkle sits below cornflower in tone — lighter, less saturated, and tilted further toward violet. Lavender sits beyond periwinkle, with the violet component dominant and the blue receding. None of these terms is laboratory language; all of them are trade shorthand for ranges that experienced buyers calibrate against parcels and master sets.
In the trade
The descriptor is marketing-friendly: it suggests softness and a feminine palette, and appeals to buyers who find saturated cornflower or royal blue too assertive for the design at hand. Periwinkle sapphires trade at lower price points than their cornflower counterparts of equivalent size and clarity, reflecting the long-standing market preference for higher saturation in fine sapphire. For tanzanite, the relationship is similar — deeper violet-blue commands the premium, and periwinkle stones sit below.
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Because the term is unstandardised, it functions as a directional cue rather than a grading attribute. Laboratory reports do not use periwinkle; they describe colour using hue, tone, and saturation references appropriate to the species, and the buyer must translate from the laboratory language to the trade vocabulary as needed. Different dealers may apply the term to noticeably different stones, so when buying remotely, photographs and master-set comparisons matter more than the descriptor itself.
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