Necklace of gold, moonstones and opals: English, London, designed by Edward Spencer for the Artificers' Guild, c. 1905

Pendant and chain of silver and gold, set with opals and decorated with plique-à-jour enamelling: USA, New York, by Tiffany and Co., probably designed by Julia Munson, c. 1910

Brooch of ivory and silver with perspex double-glazing, inside are opal and rose-quartz beads: English, London, by Gunilla Treen, 1972

Pendant of gold, opal and diamonds: English, Archibald Knox, c. 1900

Octagonal snuffbox with a hinged lid, of opal matrix and banded aragonite interior lining, mounted in gold with borders of chased foliage: possibly German or Austrian, late 18th century

Circular gold bonbonierre with top, bottom and sides decorated in dark blue enamel with opal beaded borders: German, Berlin, attributed to François-Claude Theremin and Jordan Brothers, c. 1780 - 1785

Table centre in the form of a loving cup, of partly gilt silver, with four ivory handles, each surmounted by the figure of a lion sejant, presented to Viscount Horne of Slamannan by the Unionists of Stirlingshire: English, London, by Charles Moxey and William Glennie of the Artificers' Guild, designed by Edward Spencer, c. 1911

Cover of partly gilt silver for a table centre in the form of a loving cup, presented to Viscount Horne of Slamannan by the Unionists of Stirlingshire: English, London, by Charles Moxey and William Glennie of the Artificers' Guild, designed by Edward Spencer, c. 1911

Signed tiara or neckpiece entitled 'Entry of the Queen of the Night (Mozart Series)', in yellow and white gold, carved and inlaid grey moonstone and mother-of-pearl, by Kevin Coates, London, 1996

'Ferrari Dino 206 SP' brooch of silver, fire opal, photo-plexiglass, by Gijs Bakker, Amsterdam, Netherlands, 2001

'Coral Cement 3' necklace, opal, wood, silver, cement: Journet, France by Terhi Tolvanen, 2012