1.70 Ct. Cobalt Spinel from Tanzania

One transparent Other certified Blue cobalt spinel, 1.70 carat, oval shape, measuring 7.77 x 6.31 x 4.35 mm. The gem is faceted in a mixed brilliant cut to optimize life and internal reflection, and it displays intense blue color intensity with a rich cobalt tone. Clarity is graded very slightly included, evaluated at eye level, which confirms natural origin and provides character without significantly affecting brilliance. The polish is excellent, with crisp facet junctions and consistent surface finish, and the stone is unenhanced, with no treatments applied to alter its color or clarity. Origin is Tanzania, and the combination of transparency, cut, and intense hue results in a gemstone that offers both visual depth and controlled sparkle while maintaining a versatile size for a variety of settings.

At The Natural Gemstone Company we prioritize traceability and responsible sourcing for every gem we offer, and this Tanzanian cobalt spinel is no exception. The stone was acquired through supply chains that support small scale mining communities, adhere to local mining regulations, and emphasize fair labor practices and environmental responsibility. Documentation of provenance and chain of custody is maintained to provide buyers with clarity on origin and handling, supporting a conscious consumer approach to purchasing fine gemstones. For collectors who value ethical considerations alongside aesthetic and gemological quality, this spinel represents a balanced choice, combining an unenhanced natural color, a secure clarity grade, and a durable composition suitable for everyday wear. Spinel has a well known reputation for hardness and stability, which makes this 1.70 carat oval appropriate for rings, pendants, and other frequently worn pieces, while its intense cobalt blue complements both white and yellow precious metals. The gem is presented with detailed measurements, weight, and assessments to facilitate transparent evaluation, and it is offered with the provenance information and documented sourcing practices that discerning collectors seek when building a responsible and enduring gemstone collection.