Tested by jeweler. If you win the auction I can send a video with a test by a professional gemstone tester. Length / Circuit inside: 19 cm / Thickness: 9.0 mm / Width: 1,4 cm Weight: 56,4 grams Natural gemstone Aquamarine is a pale, light blue-green or greenish-blue color, reminiscent of the shades of sea water. It sits between cyan and green on the color wheel, often described as a pastel shade. While ranging from very light blue to deep blue-green, the most prized aquamarine gems exhibit a moderate to strong dark blue to slightly greenish-blue color. Scratch Resistance: A 7.5–8 hardness Mosh rating means it is harder than quartz (7) but softer than stones like topaz (8) or diamond (10). Shipping registered.