Gemstones

284-5252 Amethyst: loose, high-quality amethyst of very beautiful quality, ca. 149.1 ct Ca. 35.58 x 29.87 x 24.82 mm, eye-clean amethyst with a beautiful fantasy cut, upper and lower parts elaborately faceted, top condition, probably Siberia. 500 € - 900 €

284-5253 Kunzite: very beautiful, intensely pink-violet coloured stone, rare large kunzite weighing ca. 45.62 carats Ca. 26.95 x 17.69 x 12.17 mm, ca. 45.62 ct, oval cut, faceted top and bottom, eye-clean. 800 € - 3.000 €

284-5254 Natural pink Burmese sapphire weighing 1.18 carats, "NO HEAT", including GRS report from 2024 Ca. 7.28 x 4.98 x 2.80 mm, 1.18 ct, cushion cut, colour "pink", unheated, untreated, origin Burma, incl. GRS report from Switzerland. 800 € - 1.200 €

284-5255 Kunzite: fine, large, intensely violet kunzite weighing ca. 58 carats Ca. 30.8 x 17.7 x 14.7 mm, ca. 58 ct, oval cut, faceted on both sides, kunzite of a rare, sought-after intense pink-violet colour, transparent, eye-clean. 900 € - 4.000 €

284-5256 Turquoise: rare and large turquoise cabochon of ca. 34.4ct Ca. 24.06 x 17.21 x 12.35 mm, ca. 34.4 ct in cabochon cut. 350 € - 700 €

284-5257 Topaz: very beautiful, large blue topaz in the special colour "London Blue", ca. 133.5 ct Ca. 32.16 x 23.67 x 15.67 mm, ca. 133.5 ct, emerald cut, faceted on both sides, very beautiful brilliance and clarity. 900 € - 2.500 €

284-5258 Sapphire, very beautiful sapphire cabochon ca. 3.8 ct Ca. 9.91 x 8.86 x 4.34 mm, ca. 3.8 ct, sapphire with an intense blue colour, cabochon cut. 600 € - 1.800 €

284-5259 Sapphire: high-quality natural 2-colour Ceylon sapphire, cabochon cut, ca. 13.2ct Ca. 12.3 x 10.9 x 9.2 mm, ca. 13.2 ct, blue & yellow, small natural inclusions, according to the supplier, origin Ceylon. 1.200 € - 3.000 €

284-5260 Zircon: Pair of blue precious zircons, ca. 5.27 ct and ca. 7.55 ct Consisting of 2 blue precious zircons, one ca. 5.27 ct and one ca. 7.55 ct, total weight ca. 12.82 ct, faceted on both sides, good clarity, from goldsmith's liquidation. 800 € - 1.500 €

284-5261 Opal: very beautiful opal cabochon of ca. 24.8ct, great play of colour Ca. 28.19 x 22.73 x 8.42 mm, ca. 24.82 ct, loose opal with cabochon cut, iridescent green, blue and pink tones. 600 € - 2.000 €

284-5262 Emerald: natural emerald weighing 1.10 carats with IGI report Ca. 6.68 x 5.10 x 4.39 mm, 1.10 ct, colour green, emerald cut, transparent, including IGI report from 2018. 500 € - 700 €

284-5263 Tourmaline: bright green tourmaline in pear cut, 10.25 ct Ca. 15.57 x 11.95 x 7.29 mm, ca. 10.25 ct, pear cut, fine green tourmaline with natural inclusions. 500 € - 1.000 €

284-5264 Tourmaline: bright green tourmaline in emerald cut, ca. 8.4 ct Ca. 18.01 x 9.95 x 4.89 mm, emerald cut, very high clarity, eye-clean, tourmaline with beautiful luminosity, faceted on both sides. 450 € - 900 €

284-5265 Emerald: loose Colombian emerald ca. 0.58 ct Ca. 4.65 x 4.75 x 3.7 mm, ca. 0.58 ct, bright green emerald, emerald cut, faceted on both sides, origin Colombia, very fine quality. 500 € - 800 €

284-5266 Sapphire: beautiful, natural yellow sapphire ca. 3.31ct Ca. 9.38 x 9.66 x 4.25 mm, ca. 3.31 ct, faceted on both sides, sapphire with a very beautiful yellow colour, high purity. 400 € - 3.000 €

284-5267 Orange-brown fancy brilliant-cut diamond ca. 1.31 ct, natural Ca. Ø7.1 mm, ca. 4.38 mm high, ca. 1.31 ct, colour in the range of fancy orange/brown, brilliant-cut diamond. 600 € - 2.000 €

284-5268 2 fine, exceptionally large coral cabochons cut into heart shapes, ca. 55ct Ca. 31 x 33 mm, ca. 55 ct, cabochon cut, both stones together form a heart shape, extremely rare in this size, very good condition. 800 € - 2.000 €

284-5269 Coral: very high-quality coral cabochon, top quality, untreated, 18.9 ct Ca. 29 × 16 × 10 mm, uniform dark red colour, absolute top quality. 500 € - 1.900 €

284-5270 Opal: very beautiful opal cabochon of ca. 21.1ct, great play of colour Ca. 24.2 x 19.44 x 9.31 mm, ca. 21.1 ct, loose opal with cabochon cut, iridescent green, blue and pink tones, flawless condition. 400 € - 2.000 €

284-5271 Large, colour-intensive mandarin garnet weighing ca. 25.57 ct Ca. 16.3 x 15.05 x 9.09 mm, ca. 25.57 ct, cabochon cut, remaining stock from a goldsmith. Although mandarin garnets often have small inclusions that may be visible to the naked eye, they are a rarity. Their beautiful fiery orange tones are the reason why this garnet has experienced an enormous increase in value in recent years. As it is also becoming increasingly difficult to obtain good mandarin garnets, an increase in value is inevitable. 500 € - 5.000 €

284-5272 Natural orange sapphire of fine quality, 2.88ct, "NO HEAT", origin Tanzania, GRS report Ca. 9.06 x 7.11 x 5.17 mm, 2.88 ct, oval cut, untreated, unheated, origin Umba (Tanzania), the stone comes with a GRS report dated April 2025. 1.000 € - 3.000 €

284-5273 Tourmaline: fine red tourmaline, also known as rubellite, ca. 4.97 ct in teardrop shape Ca. 11.15 x 11.47 x 7.36 mm, faceted teardrop shape. 400 € - 800 €

284-5274 Natural Burmese ruby weighing 1.12 carats, "NO HEAT", including GRS report Ca. 6.22 x 5.23 x 3.62 mm, 1.12 ct, colour "red", oval brilliant cut, untreated, unheated, origin Burma, incl. GRS report from Switzerland. The stone comes from the remote Mogok Stone Tract in Burma, home to the famous "pigeon blood rubies", which are the most beautiful and rarest rubies in the world in terms of quality. 1.000 € - 2.500 €

284-5275 Sapphire: rare pink sapphire "Padparadscha", 1.86ct, very beautiful quality, with IGI certificate Ca. 8.25 x 6.34 x 3.57 mm, 1.86 ct, cushion cut, rare natural colour "pink orange", transparent, untreated, including IGI report from 2016. 1.500 € - 6.000 €

284-5276 Citrine: interesting and diverse collection of fine citrine, goldsmith's liquidation, ca. 539ct Consisting of 80 coloured stones ranging from ca. 2.44 ct to ca. 20.25 ct, in a wide variety of colours, sizes and cuts, all stones faceted, beautiful quality, approx. 539 ct in total, from a goldsmith's estate. 700 € - 3.000 €

284-5277 Amethyst: large and interesting collection of amethysts, ca. 798 carats, goldsmith's estate Collection consisting of a total of 80 stones in various cuts and different colour intensities, smallest stone ca. 2.52 ct, largest stone ca. 26.5 ct, former trade fair exhibits. 800 € - 4.000 €

284-5278 Coloured stones: collection of interesting gemstones/precious stones, ca. 235.5 ct, remaining stock from a goldsmith Collection of various coloured stones, including sapphire, star sapphires, emerald, citrine, aquamarine, peridot, rubellite, kunzite, morganite and spinel. The collection has a total weight of ca. 235.5 ct, with the largest stone weighing ca. 38.4 ct and the smallest ca. 0.25 ct. Various cuts and colours, good quality, from a goldsmith's estate. 1.800 € - 3.500 €

284-5279 Natural red Burmese ruby, 1.00 ct, "NO HEAT", including AIG report Ca. 7.25 x 5.01 x 2.93 mm, 1.00 ct, oval cut, rare colour "vivid red", unheated, origin Burma, sealed condition, the stone comes with an AIG report from 2023. 1.500 € - 2.500 €

284-5280 Very nice collection of coloured stones from a goldsmith's liquidation, ca. 316.32 ct. Collection consisting of various coloured stones, ca. 316.32 carats in total, largest stone (green amethyst) ca. 42.62 carats, smallest stone ca. 0.02 carats, stones in various cuts and colours, varying qualities, including ametrine, tanzanite, ruby, aquamarine, golden beryl, tourmaline, amethyst, spinel, turquoise, aquamarine, serpentine, one brilliant-cut diamond ca. 2.31 ct, clarity I, small brown brilliant-cut diamonds totalling ca. 2.41 ct, fancy rough diamonds totalling ca. 2.47 ct, former goldsmith's stock. 3.000 € - 5.000 €

284-5281 Natural and untreated black opal weighing 3.45 carats, sourced from Lightning Ridge, including GRS report from 2024. Ca. 10.24 x 8.53 x 6.34 mm, 3.45 ct, oval cabochon cut, untreated, colour "black with play of colour (green, blue and violet)", origin Australia (Lightning Ridge), stone comes with a GRS report from Switzerland. Lightning Ridge is the top quality in the opal world. The price of black opals from Lightning Ridge can vary considerably depending on factors such as colour, clarity and carat weight. In general, black opals from Lightning Ridge are considered the rarest and most valuable opals, with prices for high-quality stones reaching up to several hundred thousand euros. 1.600 € - 3.500 €

284-5282 Highly interesting collection of 21 natural sapphires, all shrink-wrapped, with IGI report, ca. 22.71 ct Set comprising a total of 21 natural sapphires, 2 x 1.00 ct, 1 x 1.03 ct, 3 x 1.04 ct, 1 x 1.05 ct, 1 x 1.06 ct, 4 x 1.07 ct, 1 x 1.08 ct, 2 x 1.11 ct, 1 x 1.12 ct, 2 x 1.13 ct, 1 x 1.14 ct, 1 x 1.16 ct and 1 x 1.19 ct. The collection has a total weight of ca. 22.71 ct, mostly originating from Sri Lanka/Ceylon, some also "No Heat", all stones shrink-wrapped, all with micro reports. 3.500 € - 5.000 €

284-5283 Natural single-carat brilliant-cut diamond, 1.01 ct, including GIA report from 2022 Ca. 6.08 x 6.15 x 4.07 mm, ca. 1.01 ct, colour I, clarity I1, no fluorescence, stone comes with GIA report from 2022. 1.400 € - 2.000 €

284-5284 Natural fancy diamond in pear cut, 1.30 ct, AIG report Ca. 8.62 x 6.56 x 2.98 mm, 1.30 ct, pear cut, fancy yellow colour, SI clarity, sealed condition, the diamond comes with an AIG report from 2024. 4.000 € - 6.000 €

284-5285 Emerald: natural Colombian emerald ca. 1.44 ct with IGI report Ca. 8.62 x 7.69 x 4.42 mm, 1.44 ct, green transparent, heart shape, sealed condition, including micro report from 2001. 1.200 € - 2.500 €

284-5286 Emerald: natural Colombian emerald of ca. 1.12 ct with IGI report Ca. 9.15 x 6.24 x 3.92 mm, 1.12 ct, colour: green transparent, pear shape, origin: Colombia, sealed condition, incl. micro report from 2001. 600 € - 1.200 €

284-5287 Emerald: natural Colombian drop emerald of ca. 1.08 ct with IGI report Ca. 6.31 x 8.56 x 3.53 mm, 1.08 ct, pear cut, colour: green transparent, origin: Colombia, sealed condition, incl. micro report from 2000. 500 € - 1.000 €

284-5288 Diamond: One carat, natural cushion-cut diamond, 1.02 ct, with HRD report Ca. 8.81 x 5.66 x 3.79 mm, ca. 1.02 ct, colour K, clarity SI2, sealed condition, comes with HRD report from March 2021. 1.500 € - 2.000 €

284-5289 Natural brilliant-cut diamond ca. 0.66 ct, colour River E, incl. IGI report Ca. 5.48 x 5.59 x 3.44 mm, ca. 0.66 ct, colour E, clarity SI1, no fluorescence, sealed condition, stone comes with IGI report from 2025. 900 € - 1.500 €

284-5290 Rare natural pink diamond in hexagonal cut, 0.21ct, Light Purplish Pink, IGI report Ca. 3.33 x 3.91 x 2.46 mm, 0.21 ct, hexagonal modified brilliant-cut diamond, colour light purplish pink, clarity I1, no fluorescence, sealed condition, incl. IGI report from 2020. 650 € - 1.000 €

284-5292 Loose kunzite of extremely rare intense pink colour in rare heart cut, ca. 91.54 ct, report Ca. 23.31 x 31.66 x 19.68 mm, ca. 91.54 ct, double-sided faceted heart cut, pink colour, natural kunzite with AIG report from 2025. 2.600 € - 4.500 €

284-5293 Natural, untreated Burmese sapphire weighing 1.58 carats, "purplish-pink", "NO HEAT", including GRS report Ca. 6.56 x 5.60 x 4.49 mm, 1.58 ct, cushion cut, untreated, unheated, eye-clean, intense colour "purplish pink", origin Burma, the stone comes with a GRS report from 2024. 1.500 € - 3.000 €

284-5294 Sapphire: rare orange-pink sapphire "Padparadscha", 2.14 ct, "NO HEAT", extremely beautiful quality, with GRS report Ca. 7.49 x 9.77 x 3.39 mm, 2.14 ct, pear cut, orange-pink colour, natural and unheated, origin Sri Lanka/Ceylon, incl. GRS report from 2025. 3.000 € - 8.000 €

284-5295 Rare, natural red Burmese ruby weighing 3.24 carats, "NO HEAT", including GRS report Ca. 9.95 x 7.74 x 4.23 mm, 3.24 ct, colour red, oval cabochon cut, untreated, unheated, origin Burma, incl. GRS report from Switzerland. The stone comes from the remote Mogok Stone Tract in Burma, home to the famous "pigeon blood rubies", which are the most beautiful and rarest rubies in the world in terms of quality. 5.000 € - 12.000 €

284-5296 Sapphire: fine, natural Ceylon star sapphire ca. 6.61 ct, "NO HEAT", incl. IGI report Ca. 9.64 x 8.65 x 6.99 mm, 6.61 ct, colour blue, oval cabochon with distinct star effect, untreated, origin Ceylon/Sri Lanka, incl. IGI report from November 2025. 1.400 € - 3.500 €

284-5297 Spinel: natural untreated spinel with interesting colour variation and ca. 6ct, report Ca. 10.94 x 10.91 x 6.34 mm, ca. 6.007 ct, octagon cut, colour red-violet, faceted on both sides, eye-clean, incl. ÖGEMG report, replacement value ca. €10,800. 3.000 € - 6.000 €

284-5298 Natural, very rare orange-pink sapphire "Padparadscha", 1.55ct, "NO HEAT" with AIG report Ca. 7.03 x 6.55 x 3.22 mm, 1.55 ct, cushion cut, orange-pink colour, unheated, origin Madagascar, incl. AIG report from 2025. 5.000 € - 6.000 €

284-5299 Rare, beautiful and untreated violet/blue sapphire, ca. 3.86 ct Ca. 8.83 x 9.12 x 4.73 mm, ca. 3.86 ct, interesting fine violet/blue, faceted on both sides. 1.500 € - 4.000 €

284-5300 Natural blue Burma sapphire weighing 2.42 carats, "NO HEAT", with GRS report from 2024 Ca. 7.41 x 5.88 x 6.32 mm, 2.42 ct, colour "blue", oval brilliant cut, untreated, unheated, incl. GRS report from Switzerland. 4.000 € - 8.000 €

284-5301 Tourmaline: extremely rare pear-cut tourmaline, known as Paraiba, 7.09 ct, AIG report Ca. 15.17 x 10.75 x 7.08 mm, 7.09 ct, faceted drop cut, colour blue, origin Mozambique, with copper and manganese content, therefore commercially referred to as Paraiba tourmaline. This high-quality stone with a very beautiful colour comes with an AIG report from 2025. 6.000 € - 10.000 €

284-5302 Very large loose aquamarine weighing ca. 42.42 ct and in very beautiful colour/quality. Ca. 26.3 x 18.96 x 11.05 mm, ca. 42.42 ct, rectangular step cut, very beautiful colour and brilliance, eye-clean. 3.500 € - 5.000 €

284-5303 Very beautiful and large aquamarine, ca. 19.23 ct, excellent colour Ca. 18.79 x 14.08 x 9.26 mm, ca. 19.23 ct, rectangular step cut, very beautiful colour and brilliance, eye-clean. 1.400 € - 2.500 €

284-5304 Very large aquamarine weighing ca. 54.84 ct Ca. 28.48 x 21.38 x 12.61 mm, ca. 54.84 ct, light blue aquamarine of good clarity, remaining stock from a goldsmith's liquidation. 1.500 € - 5.000 €

284-5305 Rare and very beautiful peach-coloured tourmaline weighing ca. 20.35 ct. Ca. 22.32 x 14.81 x 10.27 mm, ca. 20.35 ct, beautiful peach colour, faceted oval cut on both sides, eye-clean. 2.000 € - 6.000 €

284-5306 Valuable, very beautiful natural Ceylon sapphire weighing 9.6 carats, "NO HEAT", including GRS report from Switzerland. Ca. 13.37 x 10.48 x 6.93 mm, 9.6 ct, colour yellow, cushion cut, untreated, not heated, origin Sri Lanka. This special sapphire comes with a GRS report dated June 2024. 2.500 € - 7.500 €

284-5307 Natural Ceylon sapphire in the rare colour "royal blue", 2.79 ct, "NO HEAT", including GRS report Ca. 9.05 x 7.64 x 4.93 mm, 2.79 ct, highly sought-after vivid blue colour (GRS type "royal blue"), oval brilliant cut, untreated, unheated, origin Sri Lanka, the sapphire comes with a GRS report from 2024. 3.000 € - 7.500 €

284-5308 Tourmaline: large tourmaline of outstanding quality and extremely rare size, ca. 49.87 ct Ca. 20.38 x 19.47 x 14.34 mm, ca. 49.87 ct, cushion cut, very large natural tourmaline in the extremely rare colour yellow/green (bi-colour), flawless condition, including AIG report from 2025. 12.500 € - 25.000 €

284-5309 Rare, very fine natural emerald weighing 5.15 carats, "Minor", including GRS report Ca. 10.72 x 9.13 x 7.01 mm, 5.15 ct, colour "pastel green", octagonal cut, Himalayan origin confirmed, as well as the rare "minor" quality. This significant emerald comes with a certificate dated June 2024. 3.500 € - 10.000 €

284-5310 Emerald: rare, very high-quality natural emerald weighing ca. 9.67ct, colour grade "INTENSE", including report Ca. 14.01 x 13.99 x 8.51 mm, 9.67 ct, round mix cut, intense green emerald, transparent, the stone comes with an AGL report dated January 2026. 6.900 € - 10.000 €

284-5311 Pair of very rare green beryls, ca. 70ct, GSI certificate 25.6 x 13.9 mm and 25.8 x 14 mm, identical in colour, best eye-clean quality, excellent cut, flawless, gemmological certificate. 14.000 € - 20.000 €

284-5312 Tanzanite: natural "NO HEAT" tanzanite, two-coloured violet/green chatoyant, GSI certificate Ca. 10.2 x 10.2 x 6.6 mm, 5.06 ct, cushion cut, faceted, eye-clean, untreated, rare. 3.500 € - 5.500 €

284-5313 Tanzanite: natural "NO HEAT" tanzanite, two-coloured violet/green chatoyant, GSI certificate Pear cut, 9.24 ct, 13.68 x 12.76 x 8.16 mm, faceted, eye-clean, unheated, very rare in this size. 5.500 € - 11.000 €

284-5314 Tanzanite: natural "NO HEAT" tanzanite, two-coloured violet/green chatoyant, GSI certificate Ca. 13.15 x 10 x 5.8 mm, 7.66 ct, eye-clean. Unheated tanzanites of this size are rarely offered. 4.500 € - 7.500 €

284-5316 Natural, valuable and untreated pear-cut ruby, 5.79 ct, "NO HEAT", including DSEF report Ca. 15.89 x 10.21 x 3.62 mm, 5.79 ct, pear cut, natural ruby, unheated, the DSEF report from May 2025 confirms no evidence of heating or treatment of the stone. Untreated rubies of this size are extremely rare. The ruby also comes with a valuation report with a replacement value of €30,400. 8.000 € - 16.000 €

284-5317 Rare, natural and exceptionally large pink kunzite weighing 211 carats and of beautiful quality. Ca. 46.55 x 30.76 x 22.12 mm, ca. 211 ct, oval shape, faceted upper and lower sections, natural kunzite, violet-pink colour play, transparent, flawless condition. 7.000 € - 15.000 €

284-5318 Morganite: pink beryl in extremely rare size and quality, 84.08ct "NO HEAT", AGL certificate Ca. 33.9 x 25 x 19.4 mm, completely faceted, rare cut that perfectly accentuates the pink colour, eye-clean, unheated, flawless, extremely rare in this size and quality. 14.000 € - 25.000 €

284-5319 Very valuable and extremely rare loose conch pearl weighing ca. 12.6ct Ca. 17.5 x 11.15 x 7.5 mm, ca. 12.6 g, slightly baroque shape. Conch pearls are extremely rare, natural sea pearls that form in the Caribbean queen conch (Strombus gigas). They consist of calcium-like compactions, not mother-of-pearl, and often have a unique, flame-like structure. Pink to salmon tones are typical. As they cannot be cultivated, they are considered one of the rarest pearls in the world. The beautiful, pastel-coloured conch pearl grows in the queen conch (pronounced "conk"), a large, edible sea snail. The most beautiful specimens have a wave-like "flame" structure on their surface, a creamy, porcelain-like appearance and a unique sheen. All conch pearls exhibit a unique chatoyance that, when magnified, resembles a flame, creating a delicate wave pattern of lighter and darker areas on the surface of the pearl. This striking, silky effect is caused by the formation of microcrystalline calcite fibres in concentric layers just below the surface of the pearl. In the highest quality conch pearls, this is visible to the naked eye. A combination of size, shape, colour and flame effect determines the value. Excellent pearls today cost between £4,000 and £15,000 per carat, while beautiful but not necessarily perfect pearls cost between £2,000 and £3,000 per carat! 2.000 € - 20.000 €

284-5320 Significant tanzanite in top AAA quality, 102.25ct "Intense", IGI certificate Ca. 29.9 x 24.5 x 19.4 mm, 102.25 ct oval faceted, best colour and clarity, flawless condition, current international market value €100,000 to €150,000, rising. Tanzanites of this quality in sizes over 100 ct are rarely found on the market and have great potential for appreciation in value, as stones of this size are hardly ever found anymore and Tanzania decides on the export of the best and largest stones, meaning that stones of this quality only allowed to leave the country in exceptional cases. 55.000 € - 110.000 €