● AI Appraisal Observation (Matches Jadeite A-Grade Level) Deep, dark green color; uneven color distribution; no linear patterns; translucent; pale green light transmission; surface luster close to natural sheen; no ultraviolet fluorescence; feels cool even at 24 degrees Celsius; no magnetic reaction (ring). Based on the above observations, the possibility of this being A-grade jadeite is extremely high. ● Weight of the Item Total weight including the ring: 4.2g (see measurement photo) Jadeite size: Length 1.8cm, Width 1.3cm, Thickness: 3mm → 7.2 cm³ Actual volume: Oval shape = approximately 65% = 4.5 cm³ Estimated weight: 0.45 × 3.3 = approximately 1.485g ● Carat Calculation 1g = 5ct → approximately 1.485g × 5ct = approximately 7.425 carats Weight including the ring: 4.2g Weight of the ring: 4.2g - 1.485g = 2.715g ● Specific Gravity of the Jadeite in this Item (3) Specific gravity is one of the key indicators for identifying a natural stone. This is a clear signal to distinguish it from glass or resin. With the help of AI, we obtained the following results as much as possible: Calculation considering the oval shape V = 4/3π・0.9・0.65・0.15 = 0.367 cm³ × 0.65 0.239 cm³ 1.2g - 0.8g = 0.4g 1.2g / 0.4g = 3 The specific gravity of this item, calculated with AI, is approximately 3, which falls within the standard range for jadeite (Jadeite ≈ 3.3, Nephrite ≈ 2.95). ● Ring Material: K18 contains copper, so reddish hues may appear on the back and joints (see photo). The ring also shows gold color in worn areas, so the possibility of it being gold (K18) is high. The inner engraving is illegible due to wear. ● Regarding the Production Era of this Item The seller has owned this item since at least the 1960s, making it vintage. There is no formal appraisal certificate. The photos and descriptions are all that is available, so please examine them carefully before making a purchase.