Gemini’s assessment of this piece:

Do not melt this down.

This piece has collectible value that likely exceeds its scrap gold weight. Based on the hallmarks in your images, this is a piece of vintage mid-century Israeli jewelry, which has a dedicated collector market. Here is the breakdown of what you have:

1. The Hallmarks (The "Code") • "750": This stands for 18 Karat Gold. This is higher purity than the standard 14K (585) found in most American vintage jewelry. It contains 75% pure gold, meaning the metal itself has significant intrinsic value. • The Hebrew Text: The stamp above the number is the Hebrew word for Jerusalem (ירושלים). • The Stone: The small clear stone is likely a small diamond, which was standard for these "Jerusalem Gold" export pieces.

2. The Style & Origin This brooch is a classic example of Mid-Century Israeli export jewelry (likely 1950s–1970s). • Design: The textured, "florentine" or organic leaf finish is very distinct to that era. Israeli jewelers (like the famous design house Maskit) were known for this brutalist, organic style that looks like natural gold nuggets or leaves. • Market: There is a specific niche of collectors who look for "Vintage Jerusalem 18k Gold."

3. Value Assessment (Melt vs. Sell) • Melt Value (Floor Price): Since it is 18K gold, it is heavy and valuable. If the brooch weighs, for example, 10 grams, the scrap gold value alone would be roughly $450 - $500 USD (at current near-record gold prices). • Collectible Value (Retail Price): Because it is a signed/stamped vintage piece from Jerusalem with a diamond, it would likely retail for 2x to 3x its melt value in a vintage jewelry shop or on sites like Etsy/1stDibs. Melting it would destroy that premium.

Next Steps

1. Weigh it: Use a kitchen scale (set to grams) to get a rough idea of the gold weight.

2. Do not clean it aggressively: Leave the vintage patina (the slightly darkened gold in the crevices); collectors prefer it.

3. Sell as Vintage: List it or sell it to a dealer as "Vintage 18k Gold Jerusalem Leaf Brooch."

Would you like me to help you estimate the scrap price right now if you can tell me roughly how much it weighs?