Oval Fancy Fantasy Cut Lemon Quartz 12.39 Carats. Lemon Quartz, (also known as Lemon Citrine, Lemon Topaz, Green Gold, and even Oro Verde Quartz) is a gemstone formed by heating Amethyst, Yellow Quartz and Iron together at very excessive temperatures. It is believed to aid in the building, concentration, and magnification of one's thoughts and knowledge. Item Information Dimensions (mm) 19.1 x 13.9 x 8.4mm See photos for measurements as fractions of an inch Weight (carats) 12.39 carats Clarity: VVS Type: Faceted Treatment: As described All photos and video show actual item for sale. Photos and video taken with iPhone in natural outdoor light and have not been edited; except for cover photo. Weight and size of gemstone may still vary slightly from piece to piece due to difference in calibration of weighing and measuring scales. Color may not appear exactly as in real life due to variation between computer monitor resolution and lights.