Lemon Topas Ring / new- 4.44 g - (1)

Lemon Topas Ring / new

Set in 925. Sterling silver

New and unworn

Weight: 4.44 g / 22.2 ct

11.8 mm x 11.8 mm

Ring size:

U 55
UK O
US 7,2
Fr 15
Innendurchmesser: 17,5 mm

New and unworn

The mineral Topaz, also known under the misleading trade names Finder’s Diamond, Killiecrankie Diamond, Mogok Diamond, Saxon Diamond and Slave Diamond[6], is a commonly occurring island silicate with the chemical composition Al2[(F,OH)2|SiO4]. The fluorine (F) and hydroxide (OH) ions shown in parentheses can substitute for each other in the formula (substitution, diadochy), but always in the same proportion to the other components of the mineral. An F-free OH analog is known as a synthetic compound.[7]

Topaz crystallizes in the orthorhombic crystal system and usually develops well-formed and partly very facet-rich crystals with short- to long-prismatic or columnar habit and a glassy luster on the surfaces. In pure form it is colorless and transparent. Through multiple light refractions due to lattice defects or polycrystalline structure it can also appear white and, due to impurities, take on a yellow, pinkish to brownish-red, violet, light blue and light green color, with transparency accordingly decreasing.

With a Mohs hardness of 8, Topaz is among the hard minerals and serves as a reference on the ten-point scale (up to 10) according to Friedrich Mohs. Like diamond, it is also brittle and easily cleaved along the basal plane (001) to produce perfectly smooth fracture surfaces, which is often already indicated by cleavage cracks in the stone. Irregularly broken topazes show uneven to weak shell-like fracture surfaces.

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