For sale: K18 medium-sized heart-shaped aquamarine ring. This is a very beautiful stone! Since it's impossible to distinguish between aquamarine and blue topaz just by looking at their appearance and color, I've had it appraised with an optical measuring instrument, so please rest assured. Ring size: 11.5 1. This is a used item, so although not visible to the naked eye, there is a tiny chip on the girdle (edge) of the loose stone. 2. Weak green color under a CCF filter, refractive index reading of 1.57 on a refractometer, confirming it is aquamarine. 3. The ring has been newly polished and cleaned, so it's in a sparkling condition. Aquamarine loose stone size: Length 8.5mm x Width 7.5mm (No stone weight engraving on the loose stone) Ring material: K18 yellow gold (K18 stamp present) Ring weight: 2.349g Ring thickness: Motif part: 3mm Palm side: 2mm Accessories: None Shipping method: Rakuraku Mercari Compact BOX Please feel free to ask any questions in the comments. Thank you.