This is a 2x2mm round faceted Chrome Diopside, a vibrant, deep-green, untreated gemstone from Siberia, known as an affordable alternative to emerald. With a brilliant forest-green color, this small, calibrated stone (approx. 0.05-0.10 carats) offers high clarity and sparkles well in stud earrings or dainty necklaces. Note: It is relatively soft (5.5–6 on the Mohs scale), requiring careful handling.