Sapphire Blue Dresses: The Jewel Tone for Evening

By Coveti Editorial. Read our editorial and AI policy.

The short answer: a sapphire blue dress is the jewel tone alternative to black for evening, darker than royal blue and brighter than navy. The designer pieces to know are the Crown Jewel sapphire mini dress and the Crown Jewel sapphire strapless gown, in deep sapphire bonded crepe with custom sequin embroidery. They sit in our guide to navy sequin dresses. Rebecca Vallance is a Sydney occasionwear label founded in 2011, known for structured, lined dresses cut to AU sizing, which matches UK sizing.

Sapphire blue dress searches run at about 1,600 a month in the United States, holding steady through the year and rising to about 1,900 from August to October. Unlike most colour searches, it does not dip in winter, because sapphire is an evening colour.

The pieces at a glance

How we measured: cloth names, composition, lining and care are transcribed from each Rebecca Vallance product page on 15 November 2026. Sizes cut are the sizes Coveti carries for each piece. Where the house does not publish a value, the cell says so.

Our picks

1. Crown Jewel Mini Dress

Deep sapphire bonded crepe with custom sequin embroidery and a custom diamante brooch trim, a strapless neckline, a corseted bodice, a cinched waist and an A-line mini skirt. A spare trim bag comes with the dress.

2. Crown Jewel Strapless Gown

The same embroidery and trim on a column maxi skirt with a back split. The most formal piece here, and right for a black tie gala.

3. Cambridge Long Sleeve Gown in Sapphire

All over sequin embellishments with long sleeves, shoulder pads, a crew neckline, a fitted bodice and a column maxi skirt with a back split. The covered choice for a winter gala, and the only one of the three with sleeves.

How to wear sapphire

Silver over gold. Sapphire is a cool blue, and the silver diamante on the Crown Jewel pieces points the way. White gold and crystal earrings suit it.

Black shoes ground it. A black satin pump keeps the focus on the dress; a silver sandal makes it more festive.

Keep the coat dark. A black and navy wool coat sits better over sapphire than camel.

Sapphire around the world

United States. Searches stay steady all year with an autumn rise toward gala season. A US 4 is a UK 8.

United Kingdom. Sapphire suits a winter ball and a black tie Christmas dinner. Take your usual UK size.

Europe. A UK 10 is an EU 38 and an IT 42.

Gulf. Jewel tones are a strong choice for evening weddings; the long sleeve Cambridge gown gives the most coverage of the three.

Frequently asked questions

What colour is sapphire blue?

A deep, saturated blue named after the gemstone, darker than royal blue and brighter than navy.

Is sapphire blue good for a black tie event?

Yes. A full length sapphire gown is a classic black tie choice and a strong alternative to black.

What is bonded crepe?

Crepe with a backing fused to it, which gives the cloth more body. Rebecca Vallance uses it for both Crown Jewel pieces, which helps the corseted bodice hold its shape.

How do you care for the Crown Jewel dresses?

Both are labelled delicate dry clean only. The brand asks that embellishments be covered during cleaning.

Do they run true to size?

Yes. The brand says the pieces fit true to size and that AU sizing matches UK sizing. See our size guide.

See also Rebecca Vallance gold and blue sequin dresses, New Year’s Eve dresses and blue maxi dresses.

Curated by the Coveti Studio.