Lemon Topas Ring / new- 8.78 g - (1)

Lemon Topaz Ring / new

Set in 925 silver. Sterling silver

New and unworn

Weight: 8.78 g / 43.9 ct !!!!

18.0 mm x 14.3 mm

Ring size:

U 55
UK O
US 7,2
Fr 15
Inner diameter: 17.5 mm

New and unworn

The mineral Topaz, also known under misleading trade names Finder’s Diamond, Killiecrankie Diamond, Mogok Diamond, Saxon Diamond and Slave Diamond[6], is a common island silicate with the chemical composition Al2[(F,OH)2|SiO4]. The fluorine (F) and hydroxide ions (OH) listed in the round brackets 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 typically develops well-formed and partly very plane-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. Due to numerous light refractions caused by lattice defects or polycrystalline structure, it can appear white and, with trace impurities, take on a yellow, pinkish, brownish-red, violet, light blue, and light green color, with transparency correspondingly diminishing.

With a Mohs hardness of 8, Topaz is a hard mineral and serves as a reference on the Mohs scale that ranges up to 10 (Diamond). Like diamond, it is brittle and easily cleaved along the base plane (001) into perfectly smooth break surfaces, which is often already suggested by cleavage cracks in the stone. Irregularly broken Topazes show rough to slightly shell-like fracture surfaces.

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