![Roman Rock Crystal Gemstone with Hippocamp: 2nd-3rd century A.D. With intaglio figure of a hippocamp pierced by a spear; supplied with a museum-quality impression. 1.16 grams, 15.98 mm (5/8 in.). [No Reserve] From the private collection of a Eu](https://p1.liveauctioneers.com/1191/415802/231329382_1_x.jpg?height=280&quality=70&sharpen=true&version=1777473836&width=280)
Est. £500-£700
Est. $600-$800
Est. $100-$200
![Roman Rock Crystal Gemstone with Crouching Lion: 2nd-3rd century A.D. With intaglio lion crouching with head reversed towards a crescent; supplied with a museum-quality impression. 1.40 grams, 15.92 mm (5/8 in.). [No Reserve] From the private collec](https://p1.liveauctioneers.com/1191/415802/231329389_1_x.jpg?height=280&quality=70&sharpen=true&version=1777473836&width=280)
Est. £400-£600
Est. $38,831-$50,480
![Large Group of Rock Crystal Specimens: A boxed group of prismatic crystals with pyramidal terminations, some twinned. 1.92 kg total including box, 21-69 mm (7/8 - 2 3/4 in.). [No Reserve] From Brazil. Ex Mineral Imports, London, UK. Gregor](https://p1.liveauctioneers.com/1191/415806/231335324_1_x.jpg?height=280&quality=70&sharpen=true&version=1777475205&width=280)
Est. £50-£70
![Large Mauve Cut and Polished Agate and Rock Crystal Geode Slice: A translucent geode slice showing banding on the outer edge and a crystal-lined centre, dyed. 625 grams, 22.5 cm (8 7/8 in.). [No Reserve] From Brazil. Ex Mineral Imports, London, UK. Gregory, Bottley](https://p1.liveauctioneers.com/1191/415806/231335332_1_x.jpg?height=280&quality=70&sharpen=true&version=1777479005&width=280)
Est. £40-£60
![Group of Twenty Nine [29] Rock Crystal Point Display Specimens: Boxed group of colourless pyramidal quartz crystal points. 2.11 kg total including box, 42-86 mm (1 5/8 - 3 3/8 in.). [No Reserve] From Brazil. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd](https://p1.liveauctioneers.com/1191/415806/231335375_1_x.jpg?height=280&quality=70&sharpen=true&version=1777479005&width=280)
Est. £30-£40
![A Collection of Very Large Rock Crystal Mineral Specimens: A boxed group of sizable, clear quartz crystals with pyramidal terminations. 2.85 kg total including box, 6.8-13.5 cm (2 5/8 - 5 3/8 in.). [No Reserve] From Brazil. Ex Mineral Imports, London, UK. Gre](https://p1.liveauctioneers.com/1191/415806/231335385_1_x.jpg?height=280&quality=70&sharpen=true&version=1777475205&width=280)
Est. £100-£140
![Sasanian Domed Rock Crystal Stamp Seal with Deer: 3rd-5th century A.D. Plano-convex with incuse motif of an ibex with legs folded beneath the body. 6.77 grams, 19 mm (3/4 in.). [No Reserve] London, UK, art market, 1980s. Private collection, London, U](https://p1.liveauctioneers.com/1191/415804/231332269_1_x.jpg?height=280&quality=70&sharpen=true&version=1777474526&width=280)
Est. £40-£60
Est. $6,450-$9,460
![Large Group of Thirty Seven [37] Large Rock Crystal Mineral Points: A boxed group of well-formed prismatic crystals with pyramidal terminations. 2.82 kg total including box, 58-95 mm (2 1/4 - 3 3/4 in.). [37, No Reserve] From Brazil. Ex Mineral Imports, London, UK. Gr](https://p1.liveauctioneers.com/1191/415806/231335418_1_x.jpg?height=280&quality=70&sharpen=true&version=1777475205&width=280)
Est. £50-£70
Est. $6,000-$8,800
Est. $4,238-$5,509
Est. $11,999-$15,598
Est. $44,811-$58,254
Est. $21,164-$27,513
Est. $1,989-$2,585
Est. $6,000-$8,800
Est. $23,881-$31,045
Est. $22,529-$29,287
Est. $8,000-$12,000
Est. $8,000-$12,000
Est. $800-$2,000
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