DELAVAL. Cause of the Changes of Colours

DELAVAL, Edward Hussey. An experimental Inquiry into the Cause of the Changes of Colours in Opake and Coloured Bodies. London, J. Nourse, 1777 4to, mm. 240x190; Contemporary Bodoni binding, title prin

A COLOUR CHANGE SAPPHIRE AND DIAMOND CLUSTER RING, SRI LANKA (CEYLON), NO HEATThe cushion cut sapphire with blue to purple colour change estimated to weigh 9.30 carats, within a surround of old mine c

A COLOUR CHANGE SAPPHIRE AND DIAMOND CLUSTER RING in 18ct white gold, set with a central cushion cut sapphire of 5.13 carats, encircled by a border of single cut diamonds, later British import marks,

Title: Natural Fluorite 4.48ct Cushion Cut Blue to Purplish Red Colour Change VVS Additional Information: 1 x Natural Fluorite 4.48ct Cushion Cut Blue to Purplish Red Colour Change VVS - Shape: Cushio

A synthetic colour change sapphire single-stone ring. The oval-shape synthetic colour change sapphire, to the openwork gallery and plain band. Ring size L 1/2. Weight 7.4gms. Overall condition good. M

A VINTAGE SYNTHETIC COLOUR CHANGE SAPPHIRE DRESS RING in yellow gold, set with a round cut synthetic colour change sapphire, no assay marks, size P / 7.5, 7.1g.

A VINTAGE SYNTHETIC COLOUR CHANGE SAPPHIRE DRESS RING in yellow gold, set with an emerald cut synthetic colour change sapphire, accented by foliate motifs to the mount, marked indistinctly, size N / 6

ReBoot Colour Change Action Figures-Irwin-Carded-NOS. They are Bob and Enzo. From the home of the largest toy collector on the west coast.

Title: Natural Fluorite 1.40ct Trillion Blue to Purplish Red Colour Change VVS Description: 1 x Natural Fluorite 1.40ct Trillion Blue to Purplish Red Colour Change VVS - Shape: Trillion - Weight: 1.40

Title: 379 Gram Colour Change Fluorite Specimen Treatment: Natural Gemstone: Fluorite Weight: 379 Gram Size/Dimensions: 100x80x45 mm Origin: Pakistan Shipping: Domestic: Flat-rate of $15.00 Pakistan P

Title: Natural Fluorite Colour Change 1.66ct Cushion Cut Blue to Purplish Red VVS Additional Information: 1 x Natural Fluorite Colour Change 1.66ct Cushion Cut Blue to Purplish Red VVS - Shape: Cushio

Title: Natural Fluorite Colour Change 1.84ct Cushion Cut Blue to Purplish Red VVS Description: 1 x Natural Fluorite Colour Change 1.84ct Cushion Cut Blue to Purplish Red VVS - Shape: Cushion Cut - Wei

Title: Natural Fluorite 1.44ct Trillion Blue to Purplish Red Colour Change VVS Description: 1 x Natural Fluorite 1.44ct Trillion Blue to Purplish Red Colour Change VVS - Shape: Trillion - Weight: 1.44

COLOUR-CHANGE SAPPHIRE AND DIAMOND RING The cushion-shaped colour-change sapphire between single-cut diamond shoulders, one diamond deficient, ring size approx. M Footnotes: Accompanied by a report fr

A gentleman's early 20th century platinum natural colour change sapphire signet ring. The square-shape natural colour change sapphire, to the tapered band. Accompanied by report number 20024611, dated

Mid 19th century, 34 x 77 cm, Central Asia, West Turkestan This Yomut bag face displays a repeat of ashik güls arranged in diagonal rows by colour change. The light red motifs are in lively contrast

AN EARLY 20TH CENTURY SYNTHETIC COLOUR-CHANGE SAPPHIRE AND DIAMOND CLUSTER RING a cushion-cut synthetic colour-change sapphire within a milgrain border of round-cut diamonds. Estimated total diamond w

Derived from the Greek derivitive opallios meaning to see a change in colour, this large Opal pendant has beautiful colour variations. Prong set in yellow and white gold, it has approximately 24 diamo

A ëGetsuení chair, A ëGetsuení chair, designed by Masanori Umeda for Edra, recovered, 100cm wide 85cm deep 87cm high, seat 43cm Condition Report: Some colour change to the seat and

Michael O'Connell (1898-1976) ▴ Michael O'Connell (1898-1976) 'Squares, Semicircles and Dots' paste resist on cotton 180 x 100cm Condition Report: HC81. Some fading and colour change. Stitched t

A synthetic colour-change sapphire single-stone ring. The oval-shape synthetic colour-change sapphire, with rope-twist surround and openwork gallery. Ring size M. Weight 13.8gms.

A smoky quartz pendant and two gem-set rings. To include a smoky quartz single-stone pendant, a turquoise and paste three-stone ring, together with a synthetic colour-change sapphire single-stone ring

A SYNTHETIC COLOUR-CHANGE SAPPHIRE RING a round synthetic colour-change sapphire in a claw setting. Marked '22CT', ring size J1/2 4.4 grams Stone slightly loose in setting, shank resized.

A synthetic colour-change sapphire pendant. The oval-shape synthetic colour change sapphire, within an openwork surround, with an 18ct gold curb-link chain. Chain with hallmarks for Birmingham. Length